Abstract: In response to the problem of long time consumption when using traditional methods to connect the power supply for maintenance, this article develops a fast connection device for maintenance power supply. The development process and performance testing results of the device were introduced.The field application shows that this device can effectively solve the problem of different forms of power interface in the maintenance power box and inconvenient access to power, effectively improve work efficiency, and avoid personal injury during the process of power access. It is suitable for large-scale promotion and use.