The utility model discloses a connecting piece of a wheel of a warehouse cart. The connecting piece comprises a fixed end and a movable end which are connected in a plugged mode, the fixed end is fixed at the wheel mounting position of the bottom of the warehouse cart, the movable end is fixedly connected to a wheel axle of the wheel of the warehouse cart through a base, the movable end comprises the base and protrusions formed on the base, the longitudinal section of the protrusion is in the shape like a Chinese character 'shan', grooves are formed in the side face of the base, the fixed end corresponds to the movable end in structure, protrusions embedded in the grooves are arranged on the lower portion of the fixed end, and cavities accommodating the protrusions are formed in the fixed end. According to the connecting piece of the wheel of the warehouse cart, the wheel can be dismounted through unplugging, operation is simple, and resource waste is effectively reduced.