The embodiment of the invention discloses a transformer temperature monitoring fiber pre-embedded module and system, and a transformer temperature monitoring total system. Fiber grating sensors are arranged at a plurality of position of a transformer to monitor the temperature monitoring of a plurality of positions at the same time so as to accurately find positions of hot spots of the transformer and measure the temperature of the positions of the hot spots, and therefore, the technical problems are solved that the multi-point monitoring cannot be realized, the temperature distribution condition in the transformer cannot be accurately reflected and the measured temperatures of the hot spots of the transformer winding are not accurate caused by inaccurate positions of the hot spots of the transformer in the prior art.