The invention provides a prefabricated method of an assembly-type tubular well. The method comprises the steps that a tubular well assembly unit is designed and prefabricated to obtain a processing member finished product; the butting installing of prefabricated tubular well assembly unit spare parts is conducted to form a prefabricated tubular well assembly module;prefabricated tubular well assembly units are hoisted and assembled one by one after the prefabricated tubular well assembly units are integrally assembled; installing is completed after the integrated shaping of the tubular well assembly unit is conducted, and concrete pouring is conducted; the hoisting assembling of the next layer of the tubular well assembly unit is conducted, concrete is poured again, and finally the prefabrication of the tubular well is completed. The method has the advantages that integrated prefabrication can be achieved and tubular well assembly units can be formed in the building industry, the construction is green, safe and environmentally friendly, the quality and effect are improved, and the construction period is shortened.