The invention discloses a prevention and treatment method of water scour hazards of a binding site of a mine solid waste yard and a mountain area. An intercepting ditch (2) is built in the binding site of the mountain area and the solid waste yard (6) and the intercepting ditch (2) is built from the topmost step to the bottommost step of the solid waste yard (6) according to the terrain condition; step drainage ditches (1) are built in each step; the step drainage ditches (1) are communicated with the intercepting ditch (2); sumps (4) are built at the bottommost corners of two ends of the binding site of the mountain area and the solid waste yard (6); the sumps (4) are communicated with a drainage tunnel (3); and a longitudinal bottom of the intercepting ditch (2) is in a step shape. The intercepting ditch (2) is built to communicate with every step drainage ditch (1) to form a multi-stage small area drainage system, so that drainage is drained to the sumps (4) to be guided away from a solid waste accumulation area through the drainage tunnel (3). The prevention and treatment method of the water scour hazards of the binding site of the mine solid waste yard and the mountain area has the advantages of being capable of effectively preventing the binding site of the mountain area and the solid waste yard from water scour, reducing water loss and soil erosion, protecting the environment and preventing landslides and debris flow hazards.