In order to avoid the obstacles of branches or wires, improve fishing efficiency and increase fishing fun, a trigger ejection intelligent fishing device is developed. The device adopts the way of multi-level expansion bar, uses the energy release after the compression spring is triggered to automatically eject, and realizes the linkage and quick launch of multi-level expansion bar. The front end of the device integrates a micro camera to automatically collect underwater capture status during the rotation of the rotating platform, and provides information for users through the display screen. The image information is processed by the controller to control the rotation of the rotating platform, setting out wires and fishing motor of the platform, so as to realize intelligent fishing. In this paper, the theoretical calculation and experimental demonstration of the retractable mechanism of the fishing rod are carried out. Through the simulation of the speed of the retractable fishing rod, the effect of the fishing device with the fishing rod in the range of 1780mm is achieved.