The utility model belongs to the technical field of electricity cabinet dustproof facilities, concretely relates to small -size air filter is used to electricity cabinet, including filtration equipment, set up air intake and air outlet, induced air pipeline, vortex fan on filtration equipment, vortex fan sets up filtration equipment below and with the induced air pipeline is connected, even thereis the flue -dust retainer filtration equipment bottom, the induced air pipeline connects gradually filtration equipment, vortex fan and electric cabinet, the last solenoid proportional valve that still is equipped with of filtration equipment. The utility model discloses compact structure, area are little, can let the electric elements in the electric cabinet move under clear logical wind environment, the degree of automation height, and the running cost hangs down.