The utility model discloses a quick-operating oil pressure relay. An upper cavity and a lower cavity are connected. An air relief plug is arranged at a side opening of the upper cavity; and a testing hole cover is installed on the opening of the upper cavity. An outlet hole is formed in a wiring holder that is welded to the lower portion of the lower cavity. A testing rod is arranged at a housing of an air chamber; and the air chamber is installed at the right side of the lower cavity. A connecting flange plate is installed at the side of the upper portion of the air chamber; and an oil chamber is arranged at the upper portion of an isolated corrugated pipe. An air lock is arranged at the upper portion of a balancer. According to the quick-operating oil pressure relay, operating is carried out by using dynamic pressure speed increasing caused by the accident in the oil tank; and the higher the oil pressure increasing speed is, the faster the operating is carried out. Because the spreading speed of the oil pressure wave in the transformer oil is extremely high, the quick-operating oil pressure relay makes response quickly and takes action precisely; and a signal is sent out rapidly and a power supply is cut. Moreover, the upper cavity, the lower cavity, and the other function elements are located in chambers individually, so that the mutual influences are small.