Abstract: In order to achieve effective chemical reinforcement for broken coal and rock mass with rich water, new waterproof grouting materials of polyurethane are developed. Under large-area leakage of broken coal and rock mass, normal chemical reaction can proceed. The cementing time is 1~10 min (adjustable), and the water amout above 95% is proved for time ponding. The new materials are of good reforcing performance. The cohesive strength exceeds 1 MPa for the crack face of coal and the compressive strength exceeds 8 MPa for the rockmass. It fills the gap of waterproof and reinforcement of the broken coal and rock mass in mines with large-area leakage. The engineering application has proved the validation of the new materials.