Coal mining machine traction part, power supply system thereof and coal mining machine

The invention provides a coal mining machine traction part and a power supply system thereof. The coal mining machine is characterized in that the power supply system comprises an isolation transformer, a low-voltage rectification control module, a direct-current energy storage module and a direct-current voltage regulation module; the direct-current voltage regulation module is arranged at a traction part of the coal mining machine; the isolation transformer and the low-voltage rectification control module are arranged outside the traction part; the isolation transformer is used for isolating a power supply and then outputting a low-voltage power supply; the low-voltage rectification control module is used for converting a low-voltage power supply into a direct-current power supply; the direct-current energy storage module transmits the direct-current power supply to the direct-current voltage adjusting module; the direct-current voltage adjusting module adjusts the input direct-current power supply to adapt