The invention discloses an electrolytic machining vibrating device, comprising a power mechanism and a vibrator connected with the power mechanism; the vibrator further comprises a cam mechanism, and a cam follower contacted with the cam mechanism in a rolling manner, and the power mechanism drives the cam mechanism to rotate and drives the cam follower to perform the reciprocating motion, thus the cam follower forms vibration. When the electrolytic processing is carried out, the power mechanism transmits power to the cam mechanism, and the cam mechanism is rotated under the driving of the power mechanism; for the cam follower is in rolling contact with the cam mechanism, the cam follower generates the reciprocating motion of a sine curve, namely, sine vibration; the processing tool of the electrolytic machining vibrating device forms the sine vibration on the surface of a work piece to be processed; thus the electrolysate and the electrolytic heat are effectively discharged during the processing, and the electrolytic processing precision is greatly improved.