A transformer substation multi-target accurate positioning system, said positioning system comprising an intelligent positioning terminal, a sound positioning beacon node, and a wireless data transmission base station, wherein the intelligent positioning terminal is arranged to be worn by an operator and for matching with the sound positioning beacon node so as to perform a time synchronization on the sound positioning beacon node after receiving a time synchronization signal sent by the wireless data transmission base station, and send an ultrasonic positioning signal after the completion of the time synchronization; the sound positioning beacon node, which is fixed in a set space and has a specific position coordinate, is arranged for receiving the time synchronization signal transmitted by the wireless data transmission base station and the ultrasonic positioning signal sent by the intelligent positioning terminal, decoding the ultrasonic signal sent by the intelligent positioning terminal to obtain positioning information by matching with the intelligent positioning terminal so as to perform the time synchronization after receiving the time synchronization signal, and transmitting the positioning information to the wireless data transmission base station; and the wireless data transmission base station, which is installed in the set space, is arranged for processing the positioning information transmitted by the sound positioning beacon node so as to obtain the position coordinate of the operator wearing the intelligent positioning terminal, wherein said system is characterized in that the intelligent positioning terminal measures a terminal environment temperature and humidity value of an environment in which the intelligent positioning terminal is located, and transmits the terminal environment temperature and humidity value to the sound positioning beacon node via the ultrasonic positioning signal; and the sound positioning beacon node measures a node environment temperature and humidity value of an environment in which sound positioning beacon node is located at the same time, the sound positioning beacon node transmits both the decoded terminal environment temperature and humidity value and node environment temperature and humidity value to the wireless data transmission base station, and the wireless data transmission base station processes the terminal environment temperature and humidity value and the node environment temperature and humidity value so as to perform a temperature compensation on the positioning information. an intelligent positioning terminal, a sound positioning beacon node, and a wireless data transmission base station, the sound positioning beacon node, which is fixed in a set space and has a specific position coordinate, is arranged for receiving the time synchronization signal transmitted by the wireless data transmission base station and the ultrasonic positioning signal sent by the intelligent positioning terminal, decoding the ultrasonic signal sent by the intelligent positioning terminal to obtain positioning information by matching with the intelligent positioning terminal so as to perform the time synchronization after receiving the time synchronization signal, and transmitting the positioning information to the wireless data transmission base station; and the wireless data transmission base station, which is installed in the set space, is arranged for processing the positioning information transmitted by the sound positioning beacon node so as to obtain the position coordinate of the operator wearing the intelligent positioning terminal, wherein said system is characterized in that the intelligent positioning terminal measures a terminal environment temperature and humidity value of an environment in which the intelligent positioning terminal is located, and transmits the terminal environment temperature and humidity value to the sound positioning beacon node via the ultrasonic positioning signal; and the sound positioning beacon node measures a node environment temperature and humidity value of an environment in which sound positioning beacon node is located at the same time, the sound positioning beacon node transmits both the decoded terminal environment temperature and humidity value and node environment temperature and humidity value to the wireless data transmission base station, and the wireless data transmission base station processes the terminal environment temperature and humidity value and the node environment temperature and humidity value so as to perform a temperature compensation on the positioning information.