A center-mounted control system for a bicycle, comprising a torsion detector, a torque transducer, a first wireless transceiving unit, a second wireless transceiving unit, and a control unit; wherein, the torsion detector is sleeved on a crank shaft of the bicycle and configured to detect a torque signal of the crank shaft and transmit the detected torque signal to the torque transducer; the torque transducer is fixedly connected to the torsion detector and configured to sense the torque signal transmitted from the torsion detector and send the torque signal to the first wireless transceiving unit; the first wireless transceiving unit is electrically connected to the torque transducer and configured to receive the torque signal and send the torque signal to the second wireless transceiving unit; the second wireless transceiving unit is configured to receive the torque signal and send the torque signal to the control unit; the control unit is configured to receive the torque signal, process the torque signal and control an electrical motor of the bicycle according to the processed torque signal; and a first clutch of the bicycle is sleeved on the crank shaft and is fixedly connected to one end, close to a chain ring, of the torsion detector, and the first clutch of the bicycle is fixedly connected to the chain ring configured to install a chain of the bicycle, characterized in that the center-mounted control system for a bicycle further comprises a speed and direction detecting unit configured to detect a rotation speed signal and a rotation direction signal of the chain ring and transmit the rotation speed signal and the rotation direction signal to the first wireless transceiving unit; wherein, the first wireless transceiving unit is further configured to receive the rotation speed signal and the rotation direction signal and send the rotation speed signal and the rotation direction signal to the second wireless transceiving unit; the second wireless transceiving unit is further configured to receive the rotation speed signal and the rotation direction signal and then transmit the rotation speed signal and the rotation direction signal to the control unit; and the control unit is further configured to receive and process the rotation speed signal and the rotation direction signal, and control the electrical motor according to the processed torque signal, the processed rotation speed signal and the processed rotation direction signal.. the torsion detector is sleeved on a crank shaft of the bicycle and configured to detect a torque signal of the crank shaft and transmit the detected torque signal to the torque transducer; the torque transducer is fixedly connected to the torsion detector and configured to sense the torque signal transmitted from the torsion detector and send the torque signal to the first wireless transceiving unit; the first wireless transceiving unit is electrically connected to the torque transducer and configured to receive the torque signal and send the torque signal to the second wireless transceiving unit; the second wireless transceiving unit is configured to receive the torque signal and send the torque signal to the control unit; the control unit is configured to receive the torque signal, process the torque signal and control an electrical motor of the bicycle according to the processed torque signal; and a first clutch of the bicycle is sleeved on the crank shaft and is fixedly connected to one end, close to a chain ring, of the torsion detector, and the first clutch of the bicycle is fixedly connected to the chain ring configured to install a chain of the bicycle, characterized in that the center-mounted control system for a bicycle further comprises a speed and direction detecting unit configured to detect a rotation speed signal and a rotation direction signal of the chain ring and transmit the rotation speed signal and the rotation direction signal to the first wireless transceiving unit; wherein, the first wireless transceiving unit is further configured to receive the rotation speed signal and the rotation direction signal and send the rotation speed signal and the rotation direction signal to the second wireless transceiving unit; the second wireless transceiving unit is further configured to receive the rotation speed signal and the rotation direction signal and then transmit the rotation speed signal and the rotation direction signal to the control unit; and the control unit is further configured to receive and process the rotation speed signal and the rotation direction signal, and control the electrical motor according to the processed torque signal, the processed rotation speed signal and the processed rotation direction signal..