The research object is the aerial towed system probe docking. An electromagnetic locking device is designed. The electromagnetic locking principle of rapid locking and emergency release is given. By establishing the finite element model considering the docking process, the response data of the electromagnetic docking mechanism is obtained considering the electromagnetic force as a variable. It provided a theoretical basis for the development of electromagnetic locking device for aerial towed system probe docking. This docking electromagnetic locking device provides a new idea for the design of the aerial towed system probe docking.