Mujaji, who won a gold medal at the 2000 and 2004 Games, will now represent Zimbabwe in four successive Olympic Paralympic Games.
This follows an application by the Zimbabwe Paralympic Committee.
A wildcard entry is accorded to athletes who have a good record but would have failed to qualify through the normal process.
Mujaji joins the small band of Zimbabwean athletes among them Kirsty Coventry, Ngoni Makusha, Sharon Tawengwa, Cuthbert Nyasango, Jamie Fraser McKenzie, Micheene Thorncroft and, Chris Felgate who are guaranteed of going to the 2012 Olympic Games in London from July 27.
Zimbabwe Paralympic Committee secretary, Lewis Garaba, said the decision to apply for a wildcard entry was after they had failed to participate in 2011 All Africa Games held in Maputo, Mozambique, in September due to financial constraints.
The All Africa Games were the only London Olympic qualifier close to Zimbabwe and financial constraints had also deprived Zimbabweans of the chance to take part in major international competitions, which could have given them automatic qualifying times.
Garaba said Mujaji has been accorded that opportunity following his impressive record in the competition, which saw him win the 100 metre sprint in Sydney in 2000 and in Athens in 2004 and for consistency.
The Zimbabwe committee had also asked the international Paralympic controlling body to also consider Laina Sithole, Nyaradzai Tagarira, Clement Nyoni, and Kudakwashe Hove but they were not classified.
Garaba said Mujaji had a lot of experience in international competition and stood a good chance of bringing home a medal.
Mujaji whose hand was amputated following an electrical accident at his work place, is understood to be in Zvishavane training at a state of the art gym.
The International Olympic Committee had given all athletes up to last Sunday to meet the required qualifying times or kiss goodbye to London.