The invention provides an inclined plate filter cloth filtering device and a control method and belongs to the field of control of environment water pollution. The inclined plate filter cloth filtering device comprises a tank body, an inclined plate filter cloth disc, a water collection pipe, a chemical feeding and mixing system, a washing system and a mud discharging system. A water inlet pipe is mounted on one side of the bottom of the tank body and a water outlet pipe is mounted on the other side of the tank body; a mud discharging pipe is arranged at the bottom of the tank body; a chemical feeding hole is formed in an inlet of the water inlet pipe; the water inlet pipe is connected with a pipe type mixer; a water distribution hole is formed in the pipe type mixer; the inclined plate filter cloth disc is fixed at the center of the tank body; a mud suction pipe boot is connected with a mud suction pump and is close to filter cloth; the water collection pipe is connected with the inclined plate filter cloth disc; a water collection transverse pipe is connected with the water collection pipe; the water collection pipe is communicated with a water collection ditch; and a travelling crane is mounted on a truss above the tank body. The device runs in an opposite-direction and side-direction flow filtering and precipitation synchronization manner and the operation comprises the procedures of chemical mixing, filtering, precipitation, mud discharging and backwashing. The inclined plate filter cloth filtering device has the advantages of high treatment efficiency, small occupied space and the like, can guarantee good quality of output water, and is a proper choice for a sewage plant deep treatment process.