An addition curable silicone emulsion release composition suitable for forming a releasable film having a high releasability to a pressure sensitive adhesives simultaneously with good adhesion to a plastic film substrate is provided. A release film prepared by coating and curing such composition on a plastic film is also provided. The good adhesion and the high releasability to acryl pressure sensitive adhesives are realized despite the low content of the organopolysiloxane containing a large amount of trifunctional siloxane units and alkenyl groups which had been used for realizing the adhesion. The addition curable silicone emulsion release composition is prepared by blending predetermined proportion of mixtures of high molecular weight organopolysiloxanes each containing an alkenyl group and phenyl group at particular ratio.