NOVELTY - An organic composite coating for impeller comprises an epoxy resin bottom layer (4), a rubber middle layer (3), a polyurethane anti-abrasion layer (2), and an assistant surface layer (1); where the epoxy resin bottom layer (4) is coated on impeller metal substrate base metal (5).    USE - The organic composite coating is useful for impeller (claimed).    ADVANTAGE - The organic composite coating utilizes multi-layer composite structure to combine coating layer and metal mother in high strength. Moreover, the rubber middle layer makes the epoxy resin bottom layer form a whole body with the polyurethane anti-abrasion layer; and the polyurethane anti-abrasion layer effectively reduces the impact effect of water turbine by sand and ejection flow. Additionally, the coating greatly improves the anti-abrasion performance of the impeller.    DETAILED DESCRIPTION - An organic composite coating for impeller comprises an epoxy resin bottom layer (4), a rubber middle layer (3), a polyurethane anti-abrasion layer (2), and an assistant surface layer (1); where the epoxy resin bottom layer (4) is coated on impeller metal substrate base metal (5); the epoxy resin bottom layer (4) comprises 45-55% of epoxy resin rubber material, 20-30% of low-molecular polyamide curing agent, 10-12% of oxide granular filling material, and 13-15% of toughing agent; the rubber middle layer (3) comprises polyurethane synthetic rubber, curing agent, and mineral powder; the polyurethane anti-abrasion layer (2) comprises polyurethane pre-polymer and curing agent with mass ratio of 100:13.6; and the assistant surface layer (1) comprises epoxy resin or polyurethane rubber liquid, semiconductive powder, conductive powder, and inflaming retarding powder.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the organic composite coating for impeller.    Assistant surface layer (1)    Polyurethane anti-abrasion layer (2)    Rubber middle layer (3)    Epoxy resin bottom layer (4)    Impeller metal substrate base metal (5)