The invention provides a portable dirt suction machine of a swimming pool. The portable dirt suction machine comprises a trolley, a pump, a blow-off pipe, a blow-off hose, a dirt suction pipe, a telescopic pole, a dirt suction head and a switch, wherein the pump is arranged on the trolley; the pump is provided with a switch; the blow-off pipe is arranged above the pump; a fixed leg and a movable wheel are arranged under the trolley; the fixed leg is arranged at the end part of the trolley; and the movable wheel is located on the inner side of the fixed leg. According to the portable dirt suction machine, the fixed leg and the movable wheel are arranged under the trolley, the fixed leg is arranged at the end part of the trolley and the movable wheel is located on the inner side of the fixed leg; when the portable dirt suction machine is used, the trolley is pushed upwards and can move through the movable wheel; when the portable dirt suction machine needs to be fixed, the trolley can be horizontally arranged, and the trolley can be fixed on the ground through the fixed leg; and the portable dirt suction machine is simple and rapid and is convenient to use.