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The first-stage fuel connector of launch vehicle is the core equipment to realize the propellant filling and discharge of the first-stage tank. In view of the current situation that the first-stage connector in China mainly adopts manual docking, the automatic control technology of the pneumatically driven fuel connector is studied. The structure of the connector mechanism and the main steps of docking and falling off are analyzed. The hardware system of PLC combination, DC power supply and sensor power supply combination is designed to collect the sensor parameters of the connector gas distribution table, and the solenoid valve is controlled to drive the mechanism movement. The control software is designed to classify and construct the basic data, and the multi-granularity level process steps are designed based on the object-oriented idea. The complex control logic can be realized by nesting and combining the steps of different granularity, and the process steps are described by XML file. The process content of automatic docking and falling off control process is introduced. The test results show that the time of automatic docking process and automatic falling off process is 133 s and 97 s respectively, which meets the requirements of use, and has been applied in several tasks of a certain type, which strongly supports the development of model tasks.