The present invention relates to the field of mobile phone accessories, and provides a mobile phone screen protector. The mobile phone screen protector comprises a first film, a second film, and a third film. The second film and the third film match a mobile phone screen in size. The first film extends in an X-axis direction to form a left extension portion and a right extension portion. The left extension portion is provided with at least two positioning holes, and the right extension portion is provided with at least two positioning holes. Holes for tearing off the first film are provided on the first film at the border of the second film. The present invention has advantages of avoiding the formation of air bubbles between the film and the mobile phone screen, accurate size, and low costs.