A multi-cam electric valve mechanism for engine is disclosed, which comprises: a motor fixed on a cylinder; a motor shaft wherein one side of it connected to the motor and rotated accordingly and the other side of it symmetrically provided with a plurality of rotors whose shafts are perpendicular to the motor shaft; a ring-shaped cam with a plurality of wave-shaped grooves on the circumference thereof corresponding to the rotors and for setting same; a rotation-stopping lever connected to the cylinder and cam respectively to let the cam linearly move along with it; and a valve lever wherein one side of it connected to the cam and the other side of it connected to a valve.