Closed powder collection device

The utility model provides a closed powder collection device. The closed powder collection device comprises a box body, an arrangement platform, an elevation control device and an external connection pipe, wherein the top end of a first cylindrical rod on the arrangement platform is connected with a second cylindrical rod in the elevation control device in a welding manner, the second cylindrical rod runs through a central hole of an elliptical steel plate, and the elevation or downward movement of the arrangement platform is completed by rotating a handle. By adopting the closed powder collection device, the totally-closed powder sampling process is achieved, and the problems, such as non-objective experiment result, environment pollution and health harm, caused by the scattering of powder can be avoided; meanwhile, the high efficiency and the convenience in powder sampling can be achieved, the difficulty in the sampling, caused by the weather reason, can be avoided, and the quality management and the contro