The invention discloses a remote monitoring device for an oil well. The remote monitoring device comprises a switch control device and a PLC which are arranged on an oil extraction device; an oil welloil temperature detecting instrument, a large station water temperature detecting instrument, a manifold oil temperature detecting instrument and a manifold oil pressure detecting instrument are connected to the input end of the PLC; and the PLC is internally provided with a comparator and a signal converting sending device, and a display device and a signal sending device are arranged on a receiving terminal. The real-time oil temperature condition collected on the oil well is received, the operation progress of the oil well is obtained, the temperature of the oil well can be monitored well,dangerous accidents caused by excessively high temperature are avoided, operation of a machine can be remotely controlled through the switch control device, dangerous operation is stopped in time, and the extraction security is ensured.