This paper designs a monitoring system for coal mine safety based on ZIGBEE wireless sensor network. In this project there are two sections. The first section is underground section and another section is ground section. In underground section the sensors will senseMore >>sensesessssssss the environment conditions such as temperature, humidity, gas etc.., and this information is send to the micro controller. Micro controller displays this information in the LCD and sends through ZIGBEE transmitter. In ground section ZIGBEE receiver take that information and send to the controller and controller sends the information to GSM modem and as well as displaying on the LCD. Here GSM modem sends the message to mobile when the sensors exits there threshold level. If we want to send this information to underground section we can press the switch in ground section at that time buzzer will indicate in underground section.