In the process of deep-sea purse seine culture, purse seine nets are easy to breed many attachments, which will affect the flow and exchange of water inside and outside the purse seine, and the attachments will also increase the weight of the nets, which may cause damage to the nets when impacted by the waves. Aiming at the problem of difficult to clean purse seine net, a set of purse seine net cleaning equipment has been designed. The equipment adopts the water jet cleaning technology. According to the selected high-pressure pump (rated flow 50 L/min, rated pressure 20 MPa), the theoretical straight diameter of the nozzle of the equipment and the theoretical impact force of the water jet are calculated by using hydrodynamics. The processing prototype carries out the water jet impact force comparison experiment to determine the optimal nozzle outlet shape and diameter. The results show that the equipment can match the rated pressure and flow of the high-pressure pump when the cylindrical nozzle of 0.8 mm is selected, and the pressure and flow of the pump can be maximized. It shows that when the equipment is equipped with a 0.8mm cylindrical nozzle during underwater cleaning, the jet impact force can be the largest, and the cleaning effect is the best when the target distance is kept within 10mm, which provides a reference for the research of water jet cleaning.