The utility model relates to a DC charging post, including the dc bus for being the direct current with ac inversion, still including the temperature monitoring device, be used for monitoring the temperature of dc bus, temperature monitoring means includes: optic fibre is provided with the grating on, the screw support connnection of the tie point of grating and dc bus, and the grating is used for detecting the temperature of dc bus, transmitter, transmitter and fiber connection for to optic fibre emit light bundle, optical receiver and treatment circuit, optical receiver and processing circuit connection, the optical receiver is used for receiving the light signal of optical grating reflection, and the treatment circuit is used for handling optical receiver received light signal. Above -mentioned DC charging post can real -time supervision goes out the temperature of the tie point of dc bus, safe and reliable.