Abstract: In order to solve the problem in use of“removable transformer substation+cable+combined switch”of close distance power supply system in full-mechanized mining face，load centre was put forward to supply power in full-mechanized mining face of Wangjialing Colliery.3 KJZ-2400/3300-10D 2500kVA load centers and 1 KJZ-2400/3300-10D 1250kVA load center were selected by calculating transformer volume of load center and load of combination switch of lower pressure side.Application showed that load center effectively simplified power supply system and strengthened safety and reliability of power supply，integration design reduced equipment space and improved mining speed and production efficiency.Intelligent control system and communication interface provided base for data mine construction.Load center met power supply of modern safe，high-production and high-efficient full-mechanized mining face，and ensured reliable electrical equipment supply for mining and made excellent effect.