The utility model discloses a forcible dust exhausting device for a passenger car air filter. The forcible dust exhausting device comprises an air filter and an exhaust tail pipe connected with an engine pressurizer. The forcible dust exhausting device is characterized in that a dust exhaust opening of the air filter is connected with the exhaust tail pipe through a dust suction pipe, and a dust leading valve is arranged on the dust suction pipe. The forcible dust exhausting device for the passenger car air filter utilizes certain vacuum degree at the position of the exhaust tail pipe generated by waste gas exhausted by the passenger car engine pressurizer to suction dust and impurities filtered by the air filter, the dust and the impurities are exhausted out of the car along with the waste gas, and the dust can be automatically removed without manual operation. Due to the fact that the problem that efficiency of the air filter is reduced caused by dust accumulation is solved, the dust is removed in time, and service life of the air filter is prolonged.