The utility model discloses a parallel type active anti-interference filter. Box body, a heat dissipation frame is arranged at the top of the box body; a rain shed is arranged at the top of the heat dissipation frame, an air vent is formed in the bottom of the control button, a motor is installed in the rain shed, one end of the motor is connected with fan blades, the box body comprises a noise reduction layer, an anti-interference layer and a shell from inside to outside, a moisture absorption grid is arranged in the bottom end of the noise reduction layer, and a temperature sensor is arranged at the bottom of the APF module. According to the utility model, through the arrangement of the noise reduction layer, the thermal noise generated during the operation of the internal resistor and operational amplifier of the filter can be effectively reduced; an anti-interference layer of which the electromagnetic shielding performance reaches 56dB is arranged; meanwhile, the motor and the fanare arranged at the top of the active filter, the motor drives the fan to rotate after the temperature sensor is arranged in the filter to give an alarm to the control module, and therefore internal heat of the active filter can be reduced to a great extent.