The invention discloses a miniature dust collector. The miniature dust collector comprises a sponge body, a ventilation channel, gas absorbing holes, a motor, a wind homogenizer, exhaust hoses and a sewage filtering tank, wherein the ventilation channel is arranged in the sponge body; the top end of the ventilation channel is sealed; a plurality of gas absorbing holes are formed in the sponge body; the ventilation channel is connected with an air inlet of the wind homogenizer; an air outlet of the wind homogenizer is connected with a plurality of exhaust hoses; the other ends of the exhaust hoses are immersed under the water level of the sewage filtering tank; the motor is arranged at the connection position of the ventilation channel and the wind homogenizer; exhaust holes are formed at the top of the sewage filtering tank. The air of the sponge body is extracted by the motor, so that external air enters the sponge body through the gas absorbing holes and large particles are filtered out; the air enters the sewage filtering tank through the ventilation channel and the exhaust hoses, so that small-grained pollutants are removed. The miniature dust collector is simple in structure and low in cost of components, so that the aim of filtering air with low cost is achieved.