Non-stop secondary filtering device of extruder

The utility model provides a non-stop secondary filtering device of an extruder, which effectively solves the problems of medicine infection and liquid medicine scattering. According to the technical scheme for solving the problems, the filter comprises a main body, a horizontal rectangular block is arranged in front of the main body, the rectangular block and the main body are fixed together through a fixing shaft, a disc is arranged on the fixing shaft, a plurality of feeding through holes and discharging through holes are formed in the disc, a first-stage filter screen is arranged in each feeding through hole, and a second-stage filter screen is arranged in each discharging through hole. A feeding port corresponding to the feeding through hole is formed in the left half part of the rectangular block, a discharging port corresponding to the discharging through hole is formed in the right half part of the rectangular block, a U-shaped channel is formed in the upper end of the main body, the left end of the U