The invention discloses a plastic extruding machine filter screen plate hole area limiting assembly. The plastic extruding machine filter screen plate hole area limiting assembly comprises a machine body (1). A filter plate increase and decrease module (2), a pressure sensing module (3), a speed sensing module (4) and a management module (5) are arranged on the machine body (1). During operation, the pressure and speed conditions of a sizing material are sensed by the pressure sensing module (3) and the speed sensing module (4) correspondingly, and the filter screen hole area is increased or decreased through the filter plate increase and decrease module (2) according to the sensed conditions, and the management module (5) processes summarized information. An adjustment contracting module (6) is arranged on the filter plate increase and decrease module (2), when the assembly is in an idle state, parts are contracted. A gravity sensing module (7) is arranged on the speed sensing module (4) and used for sensing the gravity condition of the sizing material on the edge of the machine body. A prompt module (8) is arranged on the management module (5). The sizing material is prevented from being scorched by controlling the area of filter screen plate holes, so that operation is smooth.