The utility model discloses a remote monitoring system for preventing spontaneous combustion of coal fields. The remote monitoring system comprises a front-end monitoring system, a transmission system and a monitoring center, wherein the front-end monitoring system transmits collected coal field temperature monitoring data to the monitoring center in real time through the transmission system, and the front-end monitoring system comprises an infrared thermal imaging device, a rotating cradle head, a travel encoder, an equipment support and a local control box; the transmission system uses a wired or wireless network; and the monitoring center comprises a monitoring server and a display. The remote monitoring system can realize all-weather large-area temperature monitoring and real-time overtemperature warning, has important significances for reducing the spontaneous combustion risk of a large coal pile and preventing occurrence of a fire disaster, and can be applied to remote automatic temperature monitoring for ultra-large-type coal fields of thermal power plants, coal mines, ports and the like.