An active engine mount for a vehicle includes an upper body which has a main rubber and an upper liquid chamber, and a lower body which is coupled to a lower portion of the upper body. An orifice circular plate divides an interior of the upper and lower bodies into the upper liquid chamber and a lower liquid chamber inside the upper and lower bodies, and has an orifice through which a fluid flows between the upper and lower liquid chambers. A diaphragm is installed below the orifice circular plate inside the upper and lower bodies, and forms the lower liquid chamber. A semi-active mount is in contact with a central portion of the diaphragm by a plunger inside the lower body, and operates by an electromagnet.