A pedal exercise signal detection device for detecting an exercise signal generated by a rider treading a pedal of a bicycle and transmitting the exercise signal to a display to present exercising reference information to the rider, comprising: a sleeve having an external circumference that is provided with at least one pressure signal connection device and multiple pressure detection units, an end of the sleeve being formed with a positioning hole; a first bearing disposed in the sleeve and set against a circumferential surface of the sleeve at the end in which the positioning hole is formed, the first bearing being coaxial with respect to the positioning hole; a stator having a positioning axle extending through the positioning hole of the sleeve and the first bearing; a fastener element for coupling the sleeve to the stator; a pedal formed with an axle hole and a receiving trough, the axle hole receiving the sleeve to insert therein so as to position the sleeve in the axle hole, the receiving trough being formed in a bottom of the pedal, the receiving trough comprising a through opening formed in a location corresponding to the pressure signal connection device of the sleeve; and a control circuit board, which is disposed in the receiving trough of the pedal, the control circuit board comprising a plurality of signal reader units provided with a structure of a probe having a top end projecting through the through opening of the receiving trough and corresponding to the pressure signal connection device so as to contact with the pressure signal connection device, characterized in that the pressure signal connection device is arranged on the external circumference of the sleeve at approximately a middle thereof, wherein the pressure detection units are mounted on the external circumference of the sleeve and arranged on two opposite sides of the pressure signal connection device, and wherein the pressure signal connection device is electrically connected to the pressure detection units through transmission lines and in that the axle hole of the pedal is provided with an external thread on an inner circumference of the axle hole and an end of the sleeve opposite to the positioning hole of the sleeve is provided with an internal thread corresponding to the external thread. a sleeve having an external circumference that is provided with at least one pressure signal connection device and multiple pressure detection units, an end of the sleeve being formed with a positioning hole; a first bearing disposed in the sleeve and set against a circumferential surface of the sleeve at the end in which the positioning hole is formed, the first bearing being coaxial with respect to the positioning hole; a stator having a positioning axle extending through the positioning hole of the sleeve and the first bearing; a fastener element for coupling the sleeve to the stator; a pedal formed with an axle hole and a receiving trough, the axle hole receiving the sleeve to insert therein so as to position the sleeve in the axle hole, the receiving trough being formed in a bottom of the pedal, the receiving trough comprising a through opening formed in a location corresponding to the pressure signal connection device of the sleeve; and a control circuit board, which is disposed in the receiving trough of the pedal, the control circuit board comprising a plurality of signal reader units provided with a structure of a probe having a top end projecting through the through opening of the receiving trough and corresponding to the pressure signal connection device so as to contact with the pressure signal connection device, characterized in that the pressure signal connection device is arranged on the external circumference of the sleeve at approximately a middle thereof, wherein the pressure detection units are mounted on the external circumference of the sleeve and arranged on two opposite sides of the pressure signal connection device, and wherein the pressure signal connection device is electrically connected to the pressure detection units through transmission lines and in that the axle hole of the pedal is provided with an external thread on an inner circumference of the axle hole and an end of the sleeve opposite to the positioning hole of the sleeve is provided with an internal thread corresponding to the external thread.