Energy-saving and emission-reducing municipal sewage treatment system

The invention discloses an energy conservation and emission reduction type municipal sewage treatment system, which comprises a filter tank; a first bidirectional screw rod is rotatably arranged on one side of the filter tank, a motor fixedly connected with the end of the first bidirectional screw rod is arranged on the filter tank, and a filter plate is slidably arranged between two opposite inner walls of the filter tank; a connecting part in threaded connection with the first two-way screw rod is arranged on the filter plate, water outlet grooves communicated with the interior of the filter tank respectively penetrate through the opposite outer walls of the filter tank, and filter sieves covering the water outlet grooves are arranged in the water outlet grooves. According to the invention, the rainwater is collected through the filter tank, the motor drives the first bidirectional lead screw to rotate around the axis of the first bidirectional lead screw to drive the connecting part to reciprocate, and the