At present, the primary and secondary integration column circuit breaker single-phase ground fault disposal function and accuracy rate is lower. Thus it is urgent to carry out assessment and verification of single-phase ground fault disposal. A single-phase ground test at an operational site is subject to the safety risk and user power supply reliability. It is not easy to carry out frequently. In this paper, a 10 kV real distribution network test platform is built. The test object is quickly connected to the test position. The single-phase ground fault can be reproduced flexibly. A single-phase ground fault treatment true test method of a primary and secondary fusion complete column circuit breaker is put forward. The disposal function and accuracy rate of the primary and secondary fusion complete column circuit breaker are effectively verified. Nine unqualified problems are found in the test. Through the establishment of a real distribution network test platform, the quality of equipment is improved, and the reliability of the network power supply is further improved. This work is supported by the Science and Technology Project of State Grid Corporation of China “Research and Application of Distribution Automation Equipment Detection Key Technology based on True Test” (No. 5442PD210006 and No. PD71-21-005).