The invention discloses a power-assisted passage system of bicycles, applied to mountain cities. The power-assisted passage system comprises a closed lane, intelligent induction door parts, a temperature and humidity control part, an air current power-assisted part, a light control part, a central control system and a solar power generation part, wherein side walls are arranged on two sides of a road surface, and a top cover is connected to the side walls, so that the closed lane is formed; the intelligent induction door parts are arranged on an inlet side and an outlet side of the closed lane; the temperature and humidity part is arranged in the closed lane and used for detecting and adjusting temperature and humidity in the closed lane; the air current power-assisted part is arranged in the length direction of the closed lane, and generates air currents flowing upwards in the gradient direction of the road surface; the light control part is used for illuminating the closed lane; the central control system is connected with the intelligent induction door parts, the temperature and humidity control part, the air current power-assisted part and the light control part and gives out control instructions to the intelligent induction door parts, the temperature and humidity control part, the air current power-assisted part and the light control part; the solar power generation part provides electric energy required by the power-assisted passage system of the bicycles.