A fan assembly for a robot vacuum cleaner, comprising an electric motor , a stator impeller , a rotor impeller and a fan cover ; the stator impeller having a shaft hole , the electric motor being mounted on one side of the stator impeller , and an output shaft of the electric motor passing through the shaft hole ; the fan cover being mounted on another side of the stator impeller , and an end surface of the fan cover away from the stator impeller being provided with an air inlet ; the rotor impeller being mounted on the output shaft of the electric motor and located between the fan cover and the stator impeller , wherein the stator impeller comprises a front impeller disc, a rear impeller disc, and a plurality of blades ; the front impeller disc comprises a round plate and a ring rim , the ring rim is disposed around a circumferential edge of the round plate and extends towards the electric motor , and the shaft hole is located in a center of the round plate ; the rear impeller disc comprises a bottom plate and a first protruding rim , a middle of the bottom plate is provided with a first round hole , the first protruding rim is disposed on the bottom plate around a circumferential edge of the first round hole and extends towards the fan cover ; and the plurality of blades are fixed between the ring rim and the first protruding rim and spaced from one another, and gaps between the blades form a plurality of air-guiding passages, the fan assembly further comprising a support seat and a second fastener, the stator impeller being mounted on the support seat ; the support seat comprising a base plate and a first leg , a middle of the base plate being provided with a second round hole ; characterized in that the base plate is provided with the first leg at two ends of the second round hole along a radial direction of the second round hole respectively; the rear impeller disc further comprises a second leg provided at two ends of the first round hole along a radial direction of the first round hole respectively, the second fastener passing through the first leg and the second leg to fasten the stator impeller to the support seat ; and the first leg is provided with a bump , the second leg is provided with a recess matching the bump , and the bump extends into the recess. the front impeller disc comprises a round plate and a ring rim , the ring rim is disposed around a circumferential edge of the round plate and extends towards the electric motor , and the shaft hole is located in a center of the round plate ; the rear impeller disc comprises a bottom plate and a first protruding rim , a middle of the bottom plate is provided with a first round hole , the first protruding rim is disposed on the bottom plate around a circumferential edge of the first round hole and extends towards the fan cover ; and the plurality of blades are fixed between the ring rim and the first protruding rim and spaced from one another, and gaps between the blades form a plurality of air-guiding passages, the fan assembly further comprising a support seat and a second fastener, the stator impeller being mounted on the support seat ; the support seat comprising a base plate and a first leg , a middle of the base plate being provided with a second round hole ; characterized in that the base plate is provided with the first leg at two ends of the second round hole along a radial direction of the second round hole respectively; the rear impeller disc further comprises a second leg provided at two ends of the first round hole along a radial direction of the first round hole respectively, the second fastener passing through the first leg and the second leg to fasten the stator impeller to the support seat ; and the first leg is provided with a bump , the second leg is provided with a recess matching the bump , and the bump extends into the recess. <EOS>