The invention discloses an aerodynamic effect release facility for an underground station of a high speed railway, which can effectively reduce the wave crest value of micropressure in the station, so as to make the wave crest value of the microrpessure meet the requirements of the design specification. The aerodynamic effect release facility comprises an underground space both ends in the vertical direction of which are communicated with a tunnel, and the station which is arranged inside the underground space, wherein an intermediate section (20) on the side wall of the underground space and an inner port of the tunnel form trumpet gradual change through a transition section (21). The aerodynamic effect release facility has the advantages that the aerodynamic effect release facility can effectively reduce the wave crest value of the micropressure in the station, so as to make the wave crest value of the microrpessure meet the requirements of environmental design, can reduce the pressure peak and the pressure gradient near the station by 20 percent approximately, effectively releases the aerodynamic effect of a high speed train entering the underground station from the tunnel suddenly, and reduces the pressure peak and the pressure fluctuation index in the station to meet the comfort level standard of people waiting for the train in the station.