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Research on circuit and control system of an environment-friendly equipment applied to hot-phosphating of the drill collar coupling screw thread has been carried out. In terms of the hot-phosphating processing, the functions and requirements of the control system of the equipment were established, which are the essential aim that we design the system. Accordingly, the designs and calculations to the key parts of the circuit and control system have been accomplished. Using PLC, achieved the controlling of the circuit and control system. The whole installation is total-closed and its structure is simple and compact. So this equipment has some important merits such as easy operation and maintenance, low cost of manufacturing and running, high utilization rate and easy maintenance of the phosphating solution. In addition, only to reprogram the LAD program of the PLC can be to meet the changes of the hot-phosphating processing which has good adaptability.