The invention relates to the technical field of gas insulation transformer equipment, in particular to an environment protection adjustable pressure releasing device of a gas insulation transformer. The environment protection adjustable pressure releasing device comprises an air chamber wall, a releasing cylinder and a pressure adjusting device. The bottom of the releasing cylinder is connected to the air chamber wall. The top of the releasing cylinder is connected to the pressure adjusting device. An isolating valve is arranged in the releasing cylinder. A testing exhaust hole and a releasing hole are formed in the cylinder wall of the releasing cylinder. A screw is arranged in the testing exhaust hole correspondingly. A piston is arranged in a second cavity. The pressure adjusting device is connected with the piston correspondingly. The piston and the releasing hole are arranged correspondingly. A high-pressure air bag is arranged on the outer wall of the releasing cylinder. The high-pressure air bag is communicated with the second cavity through the releasing hole. The pressure adjusting device is connected to the releasing cylinder, the position of the piston in the releasing cylinder can be adjusted, a pressure value is effectively released, when equipment air pressure reaches a set value, air enters the high-pressure air bag through the releasing hole, gas total leakage is avoided, and environment pollution is avoided.