The invention discloses a leech fry, snail and aquatic plant commensalism intermediate breeding method and belongs to the technical field of aquaculture. According to the method, an ecotype leech fry commensalism breeding system is built, small snails and / or zooplanktons and / or nutrients are adopted as fodder of young leeches, the breeding system is stabilized through the purification capacity of aquatic plants, deterioration of water quality is avoided, the young leeches obtain rich nutrition through composite collocation and application of small snails, zooplanktons and nutrients, leech fries are good in activity, rapid in growth and low in casualty rate, the situation that as young leeches live in groups and climb to be groups seriously, serious death is caused when the young leeches can not obtain fodder is avoided, the rate of survival is improved in the leech fry breeding stage, the method is simple in process, technical feasibility is achieved, breeding enterprises and farmers can use the method conveniently, the technical advantages of maintaining good and stable breeding environment, reducing the risks of leech fry death and the like are achieved, and the method has wide application prospects in the field of national leech breeding.