The utility model provides a device for pressure filter feeding automatic control, set up the box at the pressure filter liquid outlet, the welding baffle divide into A room and B room in this box, the baffle upper end is linked together for A room and B room, be equipped with feed liquor piping erection in box A room upper end, it installs at box B room lower extreme to be equipped with the drain pipe way, it connects the drain pipe way to be equipped with the fluid-discharge tube at box A room lower extreme, the fluid-discharge tube is equipped with the governing valve, the PLC controller is connected to box A room installation floater formula switch, PLC controller control charge pump is connected by installing at the floater formula switch of liquid outlet to the pressure filter, set up fluid-discharge tube installation governing valve control filtrating flow, according to the filtrating flow extension feeding time, floater formula switch transmission signal when the position that sets up is got rid of to filtrating, the charge pump stop work is connected to the PLC controller, realize that feeding time delay automatic control filter cake is closely knit, the efficiency of filter is improved.