The invention relates to a sand making device used for a soil test. The device comprises a barrel body, a flexible pipe and a nozzle, wherein a lower part of the barrel body is connected with the nozzle through the flexible pipe, the barrel body is filled with sand, and the sand passes through the flexible pipe and then flows out through the nozzle. The nozzle comprises a nozzle pipe body, a replaceable screen and a baffle, wherein one end of the nozzle pipe body is connected with the flexible pipe, the other end of the nozzle pipe body is connected with the screen, the screen is provided with evenly distributed meshes with uniform aperture, and the baffle is arranged on the screen. Compared with the prior art, the device uses a replaceable screen with uniform mesh aperture, overcomes disadvantages of sand sample preparation in present geotechnical centrifuge tests, and is advantageous in that the prepared sand is high in consistency and good in repeatability.