The invention discloses a scraper type ultrasonic desliming machine which comprises a water tank. An upper cover with a central through hole is fixed to the upper end of the water tank. Overflow devices are arranged on the lower side of the periphery of the upper cover. A feeding pipe is fixed in the central through hole. A buffering plate is arranged at the lower end of the feeding pipe. A material outlet is reserved between the buffering plate and the feeding pipe. A scraper conveying device is connected with the bottom of the water tank. An ultrasonic vibration plate is fixed to the bottom of the scraper conveying device. The scraper type ultrasonic desliming machine is convenient to use and obvious in effect, suspended matter in pulp, slurry and concentrates entering the water tank are classified through a water medium, the suspended matter and the slurry flow out from telescopic overflow weirs, and the concentrates are deposited into the scraper conveying device at the bottom of the water tank. Due to the usage of the ultrasonic vibration plate, the beneficiation precision is improved. The scraper conveying device can be used for conveying all the concentrates to a discharging port in time, and the interference phenomenon cannot be caused in the classification process of the pulp in the water tank.