The utility model discloses a spinning bike. The spinning bike comprises a bike frame, a sinking-type U-shaped handrail, a bike seat, pedal boards, a fly wheel and a brake block, wherein a bike seat tube and the sinking-type U-shaped handrail are arranged at the corresponding inner part of the bike frame through pull-pin rotary knobs, each pull-pin rotary knob is composed of a holding part and a thread section and is sleeved with a screw cap, a press block and a bike frame guide tube in sequence, each screw cap is provided with an internal thread and an external thread, each press block is of a shape that the upper part is round and the lower part is splayed, the round upper part of each press block is provided with an internal thread, the screw caps and the bike frame guide tubes are connected through the external threads, and the pull-pin rotary knobs, the internal threads of the screw caps and the round upper part of the press blocks are connected through the thread sections. According to the spinning bike disclosed by the utility model, by means of the connection mode that the press blocks with the internal threads are additionally arranged between the pull-pin rotary knobs and the bike frame guide tubes to reinforce the connection between the bike frame tubes and the bike frames, the bike frame tubes and the bike frame do not slide easily; and the brake block is of a V shape, thus the contact area between the brake and the fly wheel is increased, the resistance of the spinning bike can be regulated, and convenience is brought to different users in use.