In coal mine highvoltage power supply system diagram, there exist more cases using direct connection instead of cable between electrical equipments. And the existing drawing method, aiming at the direct electrical equipment, uses the way of artificial alignment which leads to tedious and slow drawing process, even reduces the accuracy. To solve the above problems, based on the characteristics of the coal mine highvoltage power supply diagram, a quick drawing method is proposed which can realize automatic capture of connections between electrical equipments, can effectively improve the speed of alignment between the two direct electrical equipments. What’s more, the alignment accuracy is much higher than manual alignment, which can reach100%. And the drawing speed can be increased more than 3 times, which reduces the complexity and cost of drawing the high voltage power supply system diagram complexity and cost, has the characteristics of high accuracy, fast speed, simple operation, and so on. It can realize fast drawing of diagram effectively.