Fecha de publicación: 05/01/2023 Fuente: Wipo Milk or dairy products Disclosed in the present utility model are a wheel assembly structure and a child activity center. The wheel assembly structure comprises a connecting base and a wheel assembly capable of being folded and unfolded, the wheel assembly being pivotingly connected to the connecting base; the wheel assembly comprises an unfolded state and a folded state, an adjustment mechanism capable of switching the wheel assembly from the unfolded state to the folded state being disposed between the connecting base and the wheel assembly; when the wheel assembly is in the unfolded state, the wheel assembly is unfolded to a first position, so that the connecting base can be moved; and when the wheel assembly is in the folded state, the wheel assembly is folded to a second position, so that the connecting base can be stably placed. The overall structure of the wheel assembly structure is simple and convenient to produce, decreasing production costs. By rotating the wheel assembly, the wheel assembly can be adjusted to the unfolded state or the folded state, and operation is convenient.