The CGJ series casing oscillators are large-diameter casing driven rock and soil drilling equipment successfully developed by the Institute of Exploration Techniques for urban construction. As a type of electromechanical hydraulic integrated equipment， they adopt a PLC-based electronic control system. This article mainly introduces the research and application of the electrical control system based on PLC. Firstly， the functional requirements of the electrical control system are analyzed. Based on the results， the hardware and program design of the electrical control system are carried out so that the electronic control system design with human-computer interaction function is realized， which integrates wireless remote control， remote wire control and emergency manual operation modes. The functional implementation of PLC program design is emphasized， which has certain application value for the research and design of electrical control systems for casing oscillators and similar equipment.