The utility model discloses a biological gas pressure boost steady voltage collection dress system, including the module of admitting air (1), pressure boost module (2) and the steady voltage exhaust module (3) connected in order, pressure boost module (2) comprise two parallel connection booster fan (4), and main air inlet pipeline (5) and the module of admitting air (1) of two parallel connection booster fan (4) are connected, and steady voltage exhaust module (3) includes stabiliser (6) and exhaust duct (7), and the inlet end of stabiliser (6) is connected with main exhaust gas pipe way (8) of booster fan (4), and the other end and the exhaust duct (7) of stabiliser (6) are connected. The utility model discloses can provide down continuation, stable biological gas in the pressure value of regulation, have the little and simple structure's of area advantage.