Roots blower

The utility model relates to the technical field of Roots blowers and in particular relates to a Roots blower capable of filtering air, silencing and protecting the moisture. The Roots blower comprises an enclosure, an air inlet positioned in the upper part of the enclosure, and an air outlet positioned in the lower part of the enclosure side, wherein the air inlet and the air outlet are respectively connected with a longitudinal filtering silencer and a transverse filtering silencer; a dustproof cover is connected to the upper part of the longitudinal filtering silencer; glass wool, a molecular sieve and a filtering net are arranged in the longitudinal filtering silencer; the glass wool, the molecular sieve and the filtering net are longitudinally fixed in the inner cavity of the longitudinal filtering silencer; and an air pressure gauge is arranged at the connecting pipe of the longitudinal filtering silencer and the air inlet. Therefore, the condition that the normal operation of the Roots blower is influenced by excessive water vapor in air is avoided; the air can be filtered, and a silencing effect can be achieved; and moreover, the Roots blower is prevented from rusting.