The invention discloses an on-site carrier signal intensity debug method of a power system. The on-site carrier signal intensity debug method of the power system includes the following steps that a downlink data set DLF is downloaded from an OFDM carrier communication system and comprises an open loop access point distance, a carrier signal transmission intensity and a signal receiving sensitivity value; a receiving signal intensity value RS1 of the downlink data set DLF is measured through an upper computer; modulation encoding data are generated according to the open loop access point distance, the carrier signal transmission intensity, the signal receiving sensitivity value and the receiving signal intensity value RS1; an uplink data set ULF is generated according to the modulation encoding data for the OFDM carrier communication system. The on-site carrier signal intensity debug method of the power system can be used by maintenance personnel of a power supply management department or a test department on the spot, carrier signal data are analyzed quantitatively and qualitatively, and debugging is convenient.