The invention discloses a manufacturing method of a titanium-steel composite board and a titanium-steel inner container cup. The method comprises the following steps: purifying the surfaces of a stainless steel plate and a titanium plate, oppositely stacking the composite surfaces of the steel plate and the titanium plate together, carrying out explosive cladding or hot-pressing cladding to obtain the composite board, and rolling the composite board to be thinner through multiple times of cold rolling and annealing. The titanium-steel composite board has the advantages that explosive cladding of the titanium layer and the steel layer is conducted, the whole structure is firm, the titanium-steel composite board not only has the corrosion resistance of titanium, but also has the excellent weldability, formability and thermal conductivity of steel, the usage amount of titanium is greatly reduced, the thickness of the composite board is reduced through multiple times of cold rolling and annealing processes, the thickness of the titanium-steel composite board is greatly reduced, and the titanium-steel composite board can be used for machining cups, bowls and other utensils.