Underground coal mine roadway roof water spraying prevention construction method

A water spraying prevention construction method for a coal mine underground roadway roof comprises the steps that a reinforcing mesh and a steel belt are laid on the surface of a roadway, and anchor rods and anchor cables are installed; constructing a drainage flow guide hole at a water spraying point of a roadway roof, inserting a drainage flow guide pipe with pipe orifices at two ends wrapped with non-woven fabrics into the hole, and blocking a gap between the flow guide hole and the flow guide pipe by using a hole sealing material; spraying concrete on the roadway top plate to form a first concrete layer with an arched lower surface; laying a non-woven fabric and an EVA waterproof guide plate; concrete is sprayed again to form a second concrete layer with the arched lower surface, and the arched curvature of the lower surface of the second concrete layer is smaller than that of the lower surface of the first concrete layer; waterproof paint is smeared; the section shape of the third concrete layer is deter