The invention relates to the technical field of robot equipment, in particular to an automatic basketball supplying mechanism of a mechanical basketball serving robot. The automatic basketball supplying mechanism comprises a basketball storage mechanism for storing and releasing basketballs and a power-assisting basketball output mechanism fixedly arranged on the top of the basketball storage mechanism, the power-assisting basketball output mechanism is fixed to the top of the basketball storage mechanism and correspondingly connected to a basketball hitting mechanism, the basketball storage mechanism includes a hollow cylinder for stacking multiple basketballs, the hollow cylinder is hollow inside, and the diameter of the inner wall of the hollow cylinder is slightly greater than that ofthe basketballs. The structural arrangement is adopted; through arrangement of the basketball storage mechanism and the power-assisting basketball output mechanism for cooperation, it can be ensured that movements of basketball supplying and basketball output can be automatically completed when the basketball robot works, and supply of manual labor is reduced.