The invention aims to provide a tool cutting edge inclination screw tap, which is applicable to machining of an internal thread of a through hole and is capable of smoothly removing chips, so that the surface quality of the internal thread is improved, and the service life of the screw tap is prolonged. The tool cutting edge inclination screw tap comprises a tap handle and an edge mounted at an end of the tap handle, the edge is provided with a cutting tap, and pivotally, a transitional inclined surface is arranged at the front end of the edge along a rotating direction. During operation, when the edge cuts in a product, owing to the function of the transitional inclined surface, the area of a cutting layer is slowly increased, cut-in process is stable, a chip containing space is increased, chips can be squeezed forwards to be removed from the front of the through hole, interference of the chips in rear tapping is eliminated, and machining precision is ensured, so that product quality is ensured. The tool cutting edge inclination screw tap is ingenious in structural design, the efficiency of machining the internal thread of the through hole can be effectively improved, and production cost can be reduced while the product quality is ensured.