Abstract: An all-in-one sensing apparatus for transformer bushing tap monitoring includes: a tap lead device connected to a grounding wire of a transformer bushing through a mounting bracket and configured to lead out the grounding wire; a sensor assembly provided on the mounting bracket, connected to an oil taking port of the bushing, and configured to detect a temperature, a pressure, a partial discharge current and a hydrogen content of the bushing and upload the temperature, the pressure, the partial discharge current and the hydrogen content of the bushing; and a power module provided on the mounting bracket, and configured to supply power to the sensor assembly through coil induction, where an output terminal of the tap lead device is connected to the power module, and an output terminal of the power module is connected to the sensor assembly.