The invention provides a method for accurately sensing the presence of indoor personnel. A sensing system and a sensing control management system of a remote end are constructed and started. The sensing system is formed by an infrared sensor probe, a single chip microcomputer and a PTZ motor device. The infrared sensor probe is driven by a PTZ motor and is fixed at an upper part space of one side in a closed space. The single chip microcomputer is used for processing a received signal of the infrared sensor probe, controlling the motor and providing web service. The sensing system is internally provided with a signal processing system, wherein the infrared sensor probe obtains an infrared wave signal in real time, the signal processing system is used for processing the infrared wave signal and forming an infrared heat source feedback value. The sensing control management system of the remote end is started and is used for managing and controlling the operation of the sensing system in the closed space. A sensing monitoring system of the remote end is started and is used for monitoring infrared wave signal data reported by the sensing system in real time.