Abstract: The invention is an improved structure for a pipe joint filter. The pipe joint equips a water-blocking valve on the top, an extruded joint structure with male screw threads on the lateral side, and a ring pipe at the free end of the pipe joint. A washer is laid between the pipe joint and the ring pipe to prevent water leakage. The ring pipe is comprised of a screw nut on the free end of pipe joint and a tightened pipe interlocked at the inner rim of a screw nut. Furthermore, a convex edge is extended from the top of the tightened pipe. From the inner angle of the convex edge heading inward, there is a stopper edge to exactly compress the ring edge of a filtration net against the stopper edge of a tightened pipe for proper fixture of the pipe joint. Thus, a filtration net can be promptly and easily fixed between a pipe joint and a ring pipe to achieve water filtration effect.