Bicycle speed control device structure

The invention discloses a bicycle speed control device structure which comprises a support. A main supporting column is arranged in the middle portion of the support. A brake box is arranged on the right side of the support. Three fans are sequentially fixed to the left side of the support from bottom to top. An electric generator and an auxiliary power source are sequentially arranged on the right side of the main supporting column from bottom to top. A drive motor is arranged on the front face of the support. An output shaft on the drive motor is connected with a drive rotary shaft through acoupler. By the adoption of a safety bicycle deceleration device, in the bicycle riding process, the bicycle speed is conveniently controlled by a rider, a brake pad can be pulled downwards through atake-up reel to rub against a rotary disc, so that the bicycle speed is reduced, the effect that the bicycle riding speed of people is limited is effectively achieved, and the problems that an accident happens and the life of