The invention discloses an auxiliary pressure system for exploring the effect of a silencer. The auxiliary pressure system comprises a shell, a working cavity and cooling fans, wherein a cooling water cover matched with the shell is arranged above the shell; through holes are arranged in the cooling water cover; screws penetrate through the through holes and are inserted into screw holes; a plurality of baffles are arranged under the cooling water cover; a cavity is arranged in each baffle; a spring and a support plate are arranged in each cavity; a base is connected to the lower end of each support plate; and a water inlet and a water outlet are installed on the mutually parallel side surfaces of the cooling water cover respectively. The bottom of each baffle make contacts with the shell and the baffle is vertical to the side surfaces of a bulged part when the cooling water cover is installed on the shell. The baffles are mutually parallel, and each two adjacent baffles are connected to different side surfaces of the bulged part. The system is convenient to clean, and has no need to frequently dismount a shell assembly from a screw compressor and install the shell assembly in the screw compressor, thus reducing the working intensity of operating personnel and prolonging the service life of the shell.