The invention relates to a main transformer online regenerative breathing apparatus provided with a wireless remote control microwave heating device. The main transformer online regenerative breathing apparatus comprises a main transformer body and an oil conservator connected with the main transformer body, the upper portion of the oil conservator is connected with a main transformer breathing pipe, the lower end of the main transformer breathing pipe is connected with a three-way pipe, the other two ends of the three-way pipe are connected with a first moisture absorption tank and a second moisture absorption tank through a first electromagnetic valve and a second electromagnetic valve respectively, the first moisture absorption tank and the second moisture absorption tank are connected with the microwave heating device, and the first electromagnetic valve, the second electromagnetic valve and the microwave heating device are electrically connected with a wireless remote control system. By means of the main transformer online regenerative breathing apparatus, the work that people need to go to a traditional main transformer breathing apparatus surrounded with high-voltage electric equipment to replace moisture absorbers when the moisture absorbers are saturated and lose efficacy, personal safety of workers and operation safety of main transformer equipment are effectively guaranteed, and waste of labor and materials and environment pollution during moisture absorber replacement of the traditional main transformer breathing apparatus are also avoided.