The invention discloses an impregnated Re3W-Sc2O3 mixed base cathode material and a preparation method of the impregnated Re3W-Sc2O3 mixed base cathode material, and belongs to the technical field of rare earth refractory metal cathode materials. Re3W replaces W, a Re3W-Sc2O3 mixed base cathode is prepared, the weight of rare earth oxide Sc2O3 accounts for about three percent to eight percent of total mass, impregnated cathode emission active salt is '411 salt' roasting matter, and the molar ratio of barium oxide to calcium oxide to aluminium oxide in finally-prepared calcium aluminate barium salt is 4:1:1. The material prepared through the method has excellent pulse electron emission performance.