The invention relates to a lead paste for battery starting/stopping, and a preparation method thereof. The lead paste is composed of a positive lead paste and a negative lead paste, and the positive lead paste comprises, by weight, 990-1010 parts of lead powder, 40-60 parts of red lead, 0.6-1.0 part of a conductive fiber, 2.5-3.5 parts of graphite, 1.5-2.5 parts of diantimony trioxide, 0.5-1.5 parts of stannous sulfate, 110-130 parts of water and 80-90 parts of sulfuric acid; and the negative lead paste comprises, by weight, 990-1010 parts of the lead powder, 0.4-0.8 parts of the conductive fiber, 2.5-3.5 parts of acetylene black, 8-12 parts of barium sulfate, 0.5-1.5 parts of humic acid, 1.5 -2.5 parts of lignin, 100-120 parts of water, 85-95 parts of sulfuric acid. The lead paste for battery starting/stopping and the preparation method thereof effectively solve the problems of poor battery performance, low electrode plate strength, easy loosening and softening, and short battery life.