The invention relates to the field of bicycles, and in particular relates to an assembling method of a universal-joint-steering and hand-foot-combining type bicycle capable of being ridden with one foot. The method involves a front wheel, a front wheel fork frame, a rear wheel, a support body, a seat saddle assembly, a steering handle, paired chain wheels and a rear wheel fork frame. The method is characterized by comprising the following six steps: assembling an universal joint part, the front wheel fork frame and the steering handle; assembling a boosting swinging rod, a boosting sliding sleeve and a boosting connecting rod; assembling a support spindle, a support spindle hole and the paired chain wheels; assembling pedaling hinge pins, the boosting connecting rod and a pulling rod swinging fork; assembling the support body and the rear wheel fork frame; and assembling the support body and the seat saddle assembly. According to the method, the universal joint assembly, the booting sliding sleeve, the boosting swinging rod and the boosting connecting rod are additionally arranged, so that two hands act together; a seat cross swinging rod and the pulling rod swinging fork are additionally arranged, so that the limitation that two pedaling plates of a general bicycle are differed by 180 degrees is overcome, and that two feet apply force in turns is avoided, and the bicycle can be ridden with one foot.