A fixing device used for medicine injection for fishes

The invention provides a fixing device used for medicine injection for fishes, belongs to the technical field of automation control and aims to solve the problem in the prior art that live fishes are hard to fix. The fixing device used for medicine injection for fishes comprises an image collecting and processing unit, a mechanical unit and a controller. The mechanical unit comprises an injection stand, sub-tight-suction units, a multiple-to-single converger, a sixth hose and a vacuum pump. A plurality of through holes are arranged in the injection stand in an arrayed manner; each through hole is corresponding to and matches one sub-tight-suction unit; the upper ends of the multiple sub-tight-suction units pass through the injection stand and are located on the same horizontal plane; fifth hoses at the lower ends of the sub-tight-suction units are connected with the sixth hose via the multiple-to-single converger; the sixth hose is connected with the vacuum pump; the image collecting and processing unit is fixed to the injection stand; the image collecting and processing unit is electrically connected with the controller via a data line; the controller controls the start and stop of the vacuum pump.