The invention provides a control system of 1/6 g low-gravity balance crane device. By the aid of tension and angle control of six cables, constant tension of the cables is realized and states of the cables are monitored. The integral control system comprises an upper computer and a lower computer which communicate directly for commands and data via an industrial Ethernet bus. Each unit of the lower computer comprises a bottom control part and a central control part, the bottom control part comprises a bottom controller, a tension sensor, a motor driving controller, an angle sensor and an acceleration sensor and performs bottom control of the cables and acquisition of sensor signals respectively so as to provide control interfaces and feedback signals for a central control chip. The control system can effectively and safely control lunar vehicles and guarantees simulation of 1/6 g low-gravity environment.