The invention discloses a method for reducing noise and removing dust in a wind passing tunnel of a draught fan. A draught fan body is included, wherein a high-speed fan is arranged in the draught fanbody, one wind passing tunnel tube is arranged on one side of the draught fan body, an electrostatic dust precipitation box is arranged at one end of the wind passing tunnel tube, the other end of the electrostatic dust precipitation box is connected with a liquid spraying dust precipitation box through a wind passing tunnel pipe, the other end of the liquid spraying dust precipitation box is connected with one wind passing tunnel tube, a liquid spraying dust precipitation pipe is connected with the bottom of the liquid spraying dust precipitation box, and a water tank is arranged at the bottom end of the liquid spraying dust precipitation pipe. According to the electrostatic dust precipitation box and a dust discharging channel, part of dust can be rapidly adsorbed on an electrode plateunder the electrostatic action via the electrode plate and wind guide plates in the electrostatic dust precipitation box, air molecules in a strong electric field can be ionized into positive ions andelectrons, the electrons encounter dust particles when moving to a positive electrode, the dust particles with negative electricity are adsorbed to a positive electrode to be collected and fall intothe detachable bottom plate, the dust can be discharged out of the dust discharging channel, and wind produced by the draught fan is preliminarily treated.