The invention discloses a double-layer composite positive pressure medical protective garment which is composed of a transparent window hood, an upper garment, trousers, an air purification fan, a fan air delivery pipe, an air delivery base, a voice and video transmitter, a net-shaped pocket, a front bonding face and side bonding faces. Coated fabrics are used as protective layers of the jacket and trousers of the protective clothing, non-coated fabrics are used as lining layers of the jacket and the trousers of the protective clothing, the two layers of fabrics are locally compounded, and non-compounded areas are communicated with each other to form an air transmission space; a matched air purification fan conveys purified air into the air conveying space of the protective suit, the purified air is evacuated and conveyed into the near space in the protective suit through micro gaps among fibers of the lining layer, and then mixed air containing carbon dioxide, heat and sweat steam is exhausted through a one-way exhaust valve at the top of the head cover. According to the utility model, the defects of poor heat dissipation, mask tightening pain and the like when medical personnel wear disposable protective clothing are eliminated, the problems of inconvenient voice communication, visual identification and carrying are successfully solved, and the disposable protective clothing can be repeatedly used after being specially cleaned and disinfected after being used.