Noise reduction device for gas pressure test

The utility model belongs to the technical field of gas pressure testing, and provides a noise reduction device for a gas pressure test, which comprises a noise reduction box body, a cavity is arranged in the noise reduction box body, a separation part is arranged in the cavity, and a circulation channel is formed by the separation part and the inner wall surface of the cavity; the noise reduction box body is provided with an air inlet and an air outlet which are communicated with the cavity, and one end of the circulation channel is communicated with the air outlet; a flow dividing part is arranged at the circulating channel and is provided with a flow dividing end, and the flow dividing end is arranged towards the exhaust port; an air inlet pipeline is arranged at the air inlet, a clamping piece is arranged at the air inlet, the air inlet pipeline is fixed to the air inlet through the clamping piece, and a sound insulation piece is arranged between the air inlet pipeline and the air inlet; sound insulation