The invention discloses a pollution-free cyprinus carpio fertilizer with controlled-release fertilizer efficiency, and a preparation method thereof. The pollution-free cyprinus carpio fertilizer with controlled-release fertilizer efficiency comprises: cottonseed meal, wheat bran, rice bran, calcium hydrophosphate, corn protein meal, wheat shorts, strong flour, rapeseed oil slag, sweet potato leaf meal, saccharose and the like; the preparation method of the pollution-free cyprinus carpio fertilizer with controlled-release fertilizer efficiency comprises the steps of smashing, mixing, pelletizing, and drying. According to the pollution-free cyprinus carpio fertilizer with controlled-release fertilizer efficiency, and the preparation method thereof, active ingredients adopted are economic and environment-friendly, the wheat bran, rice bran, rapeseed oil slag and sweet potato leaf meal are production wastes, thus not only saving the cost, but also promoting the healthy and sustainable development of green cultivation, truly realizing the cyclic economy for changing wastes into valuables, and having excellent social and economic benefits; due to addition of corn protein meal and complex vitamins, the nutrition is complete, and the growth and development of cyprinus carpio can be promoted. The preparation method is simple, and easy to operate.