Apparatus for measuring size and distribution of small liquid drops in fluid

The utility model provides a device for measuring size and distribution of droplets in a fluid. The device comprises a test box and a gas control part, wherein, the test box comprises a box body provided with an opening and a closed door, the closed door comprises an open position and a closed position, the closed door closes the opening of the box body at the closed position and exposes the opening of the box body at the open position, and a detection sheet bracket for loading detection sheets is arranged inside the box body; the gas control part comprises an high-pressure gas source, a gas pipe, an electromagnetic reversing valve and a cylinder, wherein the cylinder is provided with a cylinder shaft which is connected with the closed door of the test box, the gas control part uses the gas from the high-pressure gas source as power to control the movement of the cylinder shaft, so as to control the opening and closing of the closed door of the test box. The device has the advantages of simple structure, low