The invention relates to the field of bicycles. A parallelogram steering mechanism hands-assisted chrome alloy bicycle includes a steering handlebar, a steering sleeve, a front fork horizontal shaft, a front wheel axle frame, a front wheel assembly, a rear wheel assembly, a rear fork swing frame, Frame components, paired sprockets, transmission chains and gravity seats, as well as steering steel shafts, power-assisted linkages, tension forks and power-assisted swing rods, coaxial symmetrical square shafts are symmetrically arranged under the steering handlebars, and the upper ends of the front wheel shaft brackets are connected There is a front fork horizontal shaft, and two steering steel shafts are movable and fixed between the front fork horizontal shaft and the coaxial symmetrical square shaft to realize the synchronous swing of the steering handlebar and the front wheel axle frame, which solves the problem of bicycle steering; the coaxial symmetry The axis line of the square shaft is at the same height as the shaft center line of the pivot pin of the swing rod. When the steering handlebar swings back and forth, the power-assisted swing rod is driven to swing back and forth synchronously centered on the through hole of the support. The hole is pivoted in situ at the center, and the distance between the coaxial symmetric square axis and the front fork transverse axis remains constant.