The utility model provides a downward slant hole slag and water discharge device of a downward drilling hole, belongs to the technical field of slag and water discharge of the downward drilling hole in coal mining and solves the technical problems of providing the downward slant hole slag and water discharge device of the downward drilling hole, and the downward slant hole slag and water discharge device of the downward drilling hole can effectively discharge downward slant hole water and guarantee normal use of a drilling hole. The technical scheme includes that the downward slant hole slag and water discharge device of the downward drilling hole is provided, water discharge pipes and air inlet pipes are inserted in the downward drilling hole, the lower end of each water discharge pipe stretches into the lower portion of the downward drilling hole, the upper end of each air inlet pipe is communicated with a static pressure air duct, the static pressure air duct is communicated with a wind source, the upper end of each air inlet pipe is communicated with the static pressure air duct through a compressed air support pipe, air inlet stop valves are arranged on pipelines which communicate the air inlet pipes and the compressed air support pipe, and a general stop valve is arranged on the pipeline which communicates the compressed air support pipe and the static pressure air duct. The downward slant hole slag and water discharge device of the downward drilling hole is mainly used for discharging the slag and the water in the downward drilling hole in coal mining.