The invention discloses a moment and speed sensor of an electric bicycle. The sensor comprises a middle shaft, a chain wheel, a crank and a deformation frame, wherein the crank is fixed to the middle shaft; the deformation frame comprises an outer ring and an inner ring which are connected by a plurality of radial connecting ribs; the inner ring is fastened on the crank and the outer ring is fastened on the chain wheel; two moment sensitive magnetic steels are fixed on the inner ring and the outer surfaces of the two moment sensitive magnetic steels have reverse polarities; a signal output board is fixed on the outer ring and a linear hall element is arranged on the signal output board; a sensitive surface of the linear hall element is opposite to the outer surfaces of the two magnetic steels; the sensor also comprises a rotating member and a static member which are coaxially sleeved on the middle shaft; a secondary winding is fixed on the rotating member; a primary winding and a signal receiving board are fixed on the static member; the primary winding and the secondary winding together form an isolating transformer; the primary winding is electrically connected with an alternating current generator arranged on the signal receiving board; the signal receiving board is provided with a lead-out wire; and the secondary winding is electrically connected with the signal output board. The sensor has high work stability and sensitivity.