The invention relates to an intelligent sensor for an electric boosting bicycle, which is arranged between a center shaft and a chain wheel of the bicycle, and comprises a papilionaceous panel, an arcplate spring, a magnetic steel, a Hall element and an electric brush, wherein the papilionaceous panel is rigidly sleeved on the periphery of the center shaft; the plane of the papilionaceous panel is vertical to the center shaft; the arc plate spring is arranged between the papilionaceous panel and the chain wheel and is wound on the center shaft; one end of the arc plate spring is connected with the papilionaceous panel, while the other end is connected with the chain wheel; the magnetic steel and the Hall element are respectively arranged on the papilionaceous panel and the chain wheel; and two contacts of the electric brush are respectively close to the magnetic steel and the Hall element. The intelligent sensor only adopts less elements such as the papilionaceous panel, the arc platespring, the magnetic steel, the Hall element, the electric brush and the like in the structure, can realize the aim of regulating boost power of the bicycle, and has the advantages of simple structure, low cost, good linearity, reliable performance and convenient manufacture and installation.