A driving mechanism for sex toy includes a motor, a turntable with an eccentric pin rotatable by the motor, a sliding guide member drivable by the eccentric pin of the turntable to move linearly up and down upon rotation of the motor, a casing holding a locating block, two links respectively and bilaterally pivoted with respective middle part thereof to two opposite sides of the casing and respective rear ends thereof to two opposite sides of the sliding guide member, a finger plate pivotally connected between opposing front ends of the links, and a drag plate pivotally connected between the finger plate and the locating block.
