Aiming at the difficulty of urban parking space sharing, a shared automatic induction parking lock system based on the combination of intelligent hardware and mobile phone WeChat applet was designed. The system consists of three parts: shared parking lock, mobile phone WeChat applet and server parking information management system. The main work flow and function module design of the system are given. Parking lock system, with STM32F103 as the main control chip, using RC522 technology, GPS positioning, wireless communication, display and other modules, realize the positioning and navigation of shared parking lock, pre-booked parking card unlocking, alarm and other functions. WeChat applet uses MySQL database to store information, and uses WeChat developer tools to complete the basic functions of parking space selection, parking space reservation, parking space entry and parking space fee settlement. The parking lock is tested by reading the IC card of the vehicle, and the test results show that the parking lock has realized the designed function. WeChat APP also completed the design function after testing. The whole system can complete the automatic perception of parking space, warehouse management and cost settlement function, complete the unmanned management of parking space, and then improve the utilization efficiency of parking space.