The present invention relates to the field of organic luminescence, in particular to a phosphorescent metal complex containing electroactive radical and an application of the complex in an organic electrophosphorescent device. By utilizing the method of electrochemical deposition, the complex is prepared into a stable, firm film which is used as the luminous layer of the organic electrophosphorescent device. The structural formula of the complex is shown as follows: X is electroactive units; Z is the metal complex serving as a phosphorescence-emitting center; the X and the Z are connected together by a Y chain; m represents the number of the electroactive units. The phosphorescent metal complex containing the electroactive radical, which is prepared by the present invention, is characterized by stable chemical and electrochemical properties and can still stably illuminate after the electrochemical process of repetitive oxidation reduction; the film prepared by electrochemical codeposition is uniform and cannot easily be washed off; the organic electrophosphorescent device prepared with the deposited film shows good device performance and has a wide application prospect.