The invention relates to a high voltage isolating switch contact finger replacer, which comprises a pneumatic cylinder, wherein a first push rod is horizontally arranged on the top end of a cylinder rod of the pneumatic cylinder; a second push rod is horizontally arranged on the top end of a cylinder barrel of the pneumatic cylinder; an air inlet of the pneumatic cylinder is connected with an inflator through an air pipe; a vent valve and a one-way valve are sequentially arranged on the air pipe in a direction from the pneumatic cylinder to the inflator. The high voltage isolating switch contact finger replacer provided by the invention is convenient for replacing a contact finger, so that the workload of workers is greatly reduced, and time and labor are saved.