Protecting structure of heavy-grade stone slope

The invention provides a protecting structure of a heavy-grade stone slope. The protecting structure is subjected to modular designing, a plant growing plate and a frame are assembled in advance, during field mounting, only a protecting structure module is fixed on a hillside through an anchoring piece fixing hole, accordingly, a mounting process can be simplified, and mounting difficulty can be lowered. The plant growing plate is designed to be in a reversed-V shape, rainwater can fall off conveniently from the two ends of the plant growing plate, and the problem that when rainwater is too much, water cannot be discharged in time is avoided. Overflow holes are formed in the sealed ends of the outer sides of two son plates. Collecting is carried out through water collecting bags hung on the two sides. During a little-rain season, a control valve can be opened, water replenishing is carried out on the whole slope which needs protection through a drip irrigation pipe, moisture needed for plant growing is guaranteed, and water conveying cost is saved. The rainwater collecting bags are made of flexible materials and can be contained between two adjacent protecting structures, space is saved, and water storing capacity is enlarged.