The utility model relates to a power plug that is used for transformer substation communication screen cabinet, include the socket constitution grafting complex plug -in section with communication screen cabinet, the last lead wire section that is provided with of plug -in section, the lead wire direction of lead wire section is perpendicular with plug -in section's grafting direction, plug -in section sets the step form to with socket complex outside, and plug -in section's mesa and the port of socket side constitute to be supported by the cooperation. The lead wire direction of lead wire section perpendicular with plug -in section's grafting direction, after this communication screen cabinet uses this power plug for communication machine door can normally close, having improved communication screen cabinet equipment operating environment, greatly reduced information and communication equipment break down the probability, possess certain security, and this power plug can reduce the construction cost to different power supply unit uses.