The invention aims to provide automatic packaging film and a method for preparing the same. Mutually parallel adhesive areas (2) are arranged at intervals laterally on the same side of the film substrate, a non-adhesive area (1) is formed between two adhesive areas (2), and each non-adhesive area (1) and an adjacent adhesive area (2) form a packaging section; between the adjacent packaging sections, the non-adhesive area (1) of a packaging section and the adhesive area (2) of a next packaging section are connected through a separable splicing tape; all the packaging sections are connected through separable splicing tapes to form an entire continuous automatic packaging film (3). The invention solves the technical problems that the film is stuck or broken during automatic packaging, leading to machine shutdown and thus failure of automatic packaging.