Abstract: Based on the problem of weak remote power supply capacity of intrinsically safe power supply in coal mines, according to the centralized power supply mode of point-to-point power supply in the field, this paper analyzes the fault phenomenon caused by insufficient power supply capacity of intrinsically safe equipment when working in the field, and analyzes the reasons for the reduction of intrinsically safe power supply capacity. Based on the transient characteristics of intrinsically safe equipment and the internal resistance of power supply cable, the methods of restraining the impulse current of intrinsically safe equipment and raising the voltage through the middle of the line to reduce the line loss are proposed to improve the remote power supply capacity of intrinsically safe power supply. The experiments show that the remote power supply capability of the intrinsically safe power supply system can be effectively improved by the methods, and the power supply distance can be effectively extended under the same output power condition.