The invention aims to provide a partially-air-cushion-supported shallow-draft high-speed catamaran comprising two demihulls, vertical wings, a head air bag, a tail air bag and a cross structure. The cross structure is fixed between the demihulls, and comprises a hollow structure composed of an upper layer and a lower layer of plates, the hollow structure forms a pressurized chamber, the vertical wings are fixed at the bottom of the cross structure, air cushion chambers are composed of spaces formed by the two demihulls and the bottom of the cross structure, a hull stand is formed by the two demihulls, the cross structure and the vertical wings, the head air bag and the tail air bag are mounted at the head end and the tail end of the hull stand respectively, a tail gangplank is further mounted at the head end of the hull stand, a chamfer is arranged at the joint of the lower layer of the cross structure and each demihull, air holes are formed in each chamfer, and air in the pressurized chamber is injected into the air cushion chambers from the air holes to form air cushions so as to raise the hull stand and reduce draft. When the catamaran navigates in a hovering state, wetted surface is reduced greatly, and navigability is improved significantly.