A deep-sea net cage cleaning device, which relates to the field of aquaculture, includes a fixed frame, which is fixedly connected to the outside of the floating body, and a plurality of support tubes are slidably installed on the fixed frame, and sliding blocks are slidably fitted on the support tubes, so that The sliding block is connected with a cleaning plate through fixing bolts, and a top plate is provided on the top of the cleaning tank, and a pressing mechanism is provided on the top plate, a reciprocating vibration mechanism is provided on one side of the cleaning plate, and a clamping mechanism is provided on the support tube. Positioning mechanism, the bottom of the fixed frame is provided with a height adjustment mechanism, the present invention can effectively clean up hard seabed objects such as barnacles and shellfish outside the net, not only cutting but also crushing and crushing with the help of high-pressure airflow Clean up the attachments on the outside of the net, and at the same time, fix the support rod and the net to prevent the net from gathering inward.