At least 43 Afghan soldiers were killed in a Taliban-claimed suicide attack on a military base in Kandahar on Thursday, officials said, the third assault on a security installation this week.

Officials said the Taliban carried out two suicide car bombings at the camp, setting off several hours of fighting that began late Wednesday.

Afghanistan's ToloNews cited security officials saying that 60 soldiers were deployed to the base in the Chashmo area of Maiwand district.

Just two soldiers are known to have survived unscathed after the attack on the base, the defence ministry said in a statement, adding that nine soldiers were wounded and six unaccounted for.

Defence ministry spokesman Dawlat Waziri told AFP the attackers detonated at least one explosive-packed Humvee vehicle and razed the compound in the early morning assault.

"We think the militants used an explosive-packed Humvee vehicle to detonate the gate of the base and we are looking to see if there was more than one," Waziri said.

"Unfortunately there is nothing left inside the camp. They have burned down everything they found inside."

The Taliban claimed the ambush in a message to journalists which said all 60 security personnel on the base were killed.

Ten insurgents died, the ministry said.

"We have sent a delegation to assess the situation. The base is under ANA (Afghan National Army) control," Waziri added.

It was the third suicide and gun attack on a security installation this week and takes the total death toll to more than 120, including soldiers, police and civilians.

In each assault the Taliban used a Humvee vehicle as a bomb to blast their way into their targets.

On Tuesday, two attacks in southeast Afghanistan killed 80 people and wounded nearly 300 in the bloodiest day in the war-torn country in almost five months.

The deadliest of Tuesday's assaults was on a police compound in the city of Gardez in Paktia province where Taliban militants disguised as police detonated three explosive-packed vehicles ─ including a truck and a Humvee ─ that cleared the way for 11 gunmen to enter.

At least 60 people, including Paktia police chief Toryalai Abdyani and civilians waiting to collect documents, were killed in the blasts and ensuing battle that lasted around five hours, health officials said, with more than 230 wounded.

In the second attack in the neighbouring province of Ghazni, some 100 kilometres west of Gardez, 20 people, including 15 members of the security forces and five civilians died and 46 were wounded, officials said.

Afghan forces have struggled to combat a resurgent Taliban since the United States (US) and NATO forces formally concluded their combat mission at the end of 2014.