The utility model relates to a portable sand throwing device for suspension treatment. The utility model belongs to the field of submarine pipeline suspension treatment. The problems that time and labor are consumed when sandbags are pushed manually to be thrown in the prior art; in order to solve the problems of low working efficiency, high labor intensity and long ship occupation time in the prior art, the sand throwing device comprises a fixed frame, a rotary frame and a conveyor which are sequentially mounted from bottom to top, a rotary supporting seat is arranged at the top of the fixedframe, a vertical rotary shaft mounting hole is formed in the center of the rotary supporting seat, and a rotary supporting ring is arranged on the rotary supporting seat; the rotating frame is provided with a vertical rotating shaft, a horizontal rotating disc and a horizontal supporting shaft, the horizontal rotating disc and the horizontal supporting shaft are fixedly connected with the vertical rotating shaft, the horizontal supporting shaft is fixedly connected to the upper end of the vertical rotating shaft, and the lower end of the vertical rotating shaft is installed in the vertical rotating shaft installation hole. The conveying machine is provided with a machine frame, the two sides of the machine frame are each provided with a clamping jaw, the tail end of the machine frame is provided with a balance weight, and the clamping jaws of the conveying machine are installed on a horizontal supporting shaft. The utility model has the advantages of convenience in mounting and dismounting, quickness in use and small occupied space.