Automatic cleaning water sample pretreatment device

The utility model provides an automatic cleaning water sample pretreatment device, which comprises a shell, a water inlet pipe, a water outlet pipe, a water inlet pipe and a water outlet pipe, the water inlet is formed in one end of the shell; the water outlet is formed in the other end of the shell; the filter rod device comprises a filter rod main body accommodated in the filter cavity; the ultrasonic device comprises 2-5 staggered ultrasonic vibrators which are communicated with the filtering cavity, and the ultrasonic device comprises a first ultrasonic vibrator which is arranged at one end, close to the water inlet, of the side wall of the shell, and a second ultrasonic vibrator which is arranged at one end, close to the water outlet, of the side wall of the shell; and the ultrasonic vibrator emits ultrasonic waves to remove solid impurities in the water sample. The ultrasonic vibrators are arranged in a staggered mode to prevent ultrasonic vibrations from counteracting each other to reduce the cleaning