The utility model belongs to the technical field of desulfurization waste liquid acid making devices, and discloses a filter device for coking desulfurization waste liquid acid making pretreatment, which comprises a rack, a case is arranged on one side of the rack, a
discharge port is arranged on the outer wall of the case, a feed
pipe is arranged on the outer wall of the case, a spray head is arranged on the outer wall of the feed
pipe, and a filter screen is arranged on the outer wall of the spray head. A bearing is embedded in the inner side wall of the case, a bottom plate is fixedly connected to the inner ring of the bearing, and a filter frame is fixedly connected to one side of the bottom plate. Through arrangement of the case, the feeding
pipe, the filter frame, the first gear, the motor, the second gear, the supporting rod and the cleaning plate,
raw material liquid is uniformly added into the filter frame, the motor is started to drive the filter frame to rotate at a high speed, and the cleaning plate scrapes the inner wall of the filter frame when the filter frame rotates, so that the condition that filter holes of the filter frame are blocked in the filtering process is avoided; the filtering frame rotates at a high speed to throw the liquid into the case, so that the filtering speed is greatly increased.