The invention discloses an integrated on-line diagnosis method and system for the temperature and current of a high-voltage switchgear and a medium. The on-line diagnosis method comprises: measuring aload current I, an ambient temperature T0, and an actually measured temperatureTsc of a temperature measurement point of a high-voltage switchgear; calculating an actually measured temperature rise delta TSC of the temperature measurement point based on the ambient temperature T0 and the actually measured temperature Tsc of the temperature measurement point and calculating an ideal temperature rise deltaTLX of the temperature measurement point by mappingbased on the load current I; dividing the ideal temperature rise deltaTLX by the actually measured temperature rise delta TSC of the temperature measurement point to obtain a load temperature rise health degree R of the temperature measurement point; and comparing the load temperature rise health degree R with a preset state threshold range to compare and determine the device load temperature rise state of the high-voltage switchgear.Therefore, real-time monitoring of the current load and temperature rise during the operation of the switchgear can be realized and the operation status of the equipment is determined accurately according to the temperature rise and current load changes.