An ultra-high-molecular-weight fiber manufacturing method is provided. The method includes: removing moisture in a mixed liquid to form a to-be-processed raw material, and supplying the to-be-processed raw material to a spinning device, where the spinning device heats the to-be-processed raw material in different stages, to make the to-be-processed raw material form a semi-molten state and be extruded toward a discharge outlet, to spin at least one fibril; cooling the at least one fibril, to form a first wire; if hardness of the first wire is not in a hardness range, selecting at least two discontinuous heating zones located in the spinning device to perform temperature adjustment; stretching, heating, and re-stretching the first wire, to form a second wire; winding the second wire around a drum; and stretching, drying, and re-stretching the second wire, to form a final wire product.