The invention provides a leech breeding method which comprises the following steps: 1) breeding young leeches, namely selecting healthy seed leeches for cultivation, feeding the seed leeches into an obstetric table for breeding, picking up egg cocoons within 18-25 days, putting the collected egg cocoons into a hatching house, controlling the temperature of the hatching house to be 25-30 DEG C andcontrolling the humidity to be 75-85% for hatching, illuminating the egg cocoons during hatching, and hatching young leeches; 2) treating a water pool, namely injecting water into the water pool, arranging an ecological floating bed on the water surface, arranging No.2 honeysuckle flower on the ecological floating bed, wherein the area of the ecological floating bed accounts for 0.75-0.9 of the area of the water pool, regulating the pH value of the water in the pool to be 6.5-7.5, adding 200-250kg of snails into the pool per mu, enabling the snails to naturally grow and breed so as to provideanimal baits for the leeches; 3) stocking the young leeches; 4) controlling the water level. According to the method, the water quality can be regulated in time, and the breeding density and the survival rate of the leeches are greatly increased.