Manual pedal stepless speed-changing bicycle

The utility model discloses a manual pedal type stepless speed changing bicycle. A driving wheel formed by speed changing wheel discs whose conical surfaces are opposite are installed on the centre shaft of the two sides of the frame of the bicycle. Pedals are installed on the two sides of the driving wheel, V-belts are hung on the wheel edges of the two speed changing wheel discs, and a compression spring is installed between the two disc surfaces. A tappet which can move forward and backward and is operated by a gear lever is installed on the front sloping beam of the frame, and an inserter which can make the two speed changing wheel discs approach or separate is installed on the end of the tappet near the speed changing wheel discs. Attaching wheels are supported on the two sides of the rear wheel spoke on the rear shaft of the bicycle, V-belt grooves are arranged on the outer edge wheel surface of the attaching wheels, and ratchets driving the rear wheel to rotate in a single direction are arranged on the inner sides of the attaching wheels. A tensioner which can push and press the V-belt to tension is installed above the V-belt and on the rear sloping beam of the frame. Unitizing sprocket wheel and chain transmission are not needed in the travelling and speed change of the bicycle, so the utility model which has the advantages of low cost and light weight can realize stepless speed change with fast speed change and high speed ratio.