Building water supply and drainage anti-blocking system and anti-blocking method

The invention discloses a building water supply and drainage anti-blocking system and anti-blocking method.The building water supply and drainage anti-blocking system comprises a pipeline body, the left side of the bottom of an inner cavity of the pipeline body is fixedly connected with an inclined leakage plate, and the left side of the pipeline body is rotationally connected with a driven rod through a bearing part. According to the building water supply and drainage anti-blocking system and the anti-blocking method, the driving mechanism is mounted on the left side of the pipeline body and is in butt joint with the driven rod, so that a bidirectional blade can be driven by a motor to have enough rotating force to smash blockages during blockage; and a reciprocating screw rod is matched for use, so that the bidirectional blade can reciprocate to increase the crushing area, a liquid storage barrel can be opened in the moving process to add a lubricant to increase the crushing smoothness, and meanwhile, a scr