The present invention provides an underwater robot with high flexibility of aquaculture environment monitoring and an operation method thereof, which relates to the field of underwater robots with high flexibility of aquaculture environment monitoring. The underwater robot with high flexibility of aquaculture environment monitoring and the operation method thereof include a body, wherein the center of the front and rear side surfaces of the body is fixedly connected with two support blocks, one side surface of each of the support blocks is rotatably connected with a push tube, the upper and lower sides of the inner wall of each of the push tubes are buckled with a filter net plate, the upper and lower side surfaces of each of the push tubes are fixedly connected with a groove ring, the left and right sides of the inner wall of each of the groove rings are provided with a cavity, and the inner wall of each of the cavities is provided with a rotating mechanism. When the device is in operation, it can avoid the problem that the device is wrapped by aquatic plants and affects the power device, increase the detection efficiency of the device, reduce the cost of maintenance or replacement of parts of the device, increase the scope of use of the device, and increase the adaptability of the device.