The utility model relates to a wheel of a track detection trolley. According to the wheel, two synchronous belt wheels which are supported by axles are respectively arranged at bottom two ends of two axle frame plates which are corresponding in location, the two synchronous belt wheels are provided with a closed-loop tooth-shaped synchronous belt which is engaged with the synchronous belt wheels, the rubber external surface of the closed-loop tooth-shaped synchronous belt is in connection with the surface of a track, and a top plate which is used for supporting a trolley main body is arranged at the tops of the two axle frame plates. The area of connection between the rubber external surface of the closed-loop tooth-shaped synchronous belt of the wheel and the surface of the track is far greater than that between a steel wheel in the prior art and the surface of the track, and the friction resistance between the wheel and the track is relatively high due to the characteristics of rubber of the external surface of the closed-loop tooth-shaped synchronous belt, so that the phenomenon of skidding of the steel wheel is thoroughly overcome. The wheel has the outstanding advantages of simple structure, ingenious conception and superior performance.