Electric push-pull needle type filter device

The utility model discloses an electric push-pull needle type filter device which comprises an injector and further comprises a servo motor, a rotating rod and a bottom plate, the servo motor is fixedly arranged at the upper end of the bottom plate, an output shaft of the servo motor is fixedly connected with a gear, the gear is in meshed connection with the side edge of the rotating rod in a transmission mode, and the rotating rod is fixedly connected with a pushing module. Two fixing devices are fixedly connected to the pushing module, the fixing devices, the first fixing device, the second fixing device and the third fixing device are sequentially installed outside the injector, a first limiting ring and a second limiting ring are arranged outside the rotating rod, a first mounting plate and a second mounting plate are fixedly arranged on the two sides of the bottom plate respectively, and the rotating rod penetrates through the first mounting plate. Test tube racks are fixedly connected to the side surfac