Coal mining machine monitoring device

The invention relates to a coal mining machine monitoring device which comprises a sensor unit, a wireless transmitter and a wireless receiver. The sensor unit and the wireless transmitter are connected with each other and respectively installed on a coal mining machine. The wireless transmitter is connected with the wireless receiver through a wireless network, the wireless receiver is installed on a support controller and connected with the support controller, and the sensor unit is used for obtaining state information of the coal mining machine and sending the state information to the wireless receiver through the wireless transmitter. The wireless receiver receives the state information and sends the state information to the support controller, and the support controller monitors the coal mining machine according to the state information. The state information comprises positional information of the coal mining machine, water pressure of cooling water, cooling water flow and oil pump output pressure. The coal mining machine monitoring device can maintain state information transmission stability and improve coal mining machine monitoring effects.