The invention relates to a stress visual composite film for treating a cancer. A biocompatible material is subjected to corona charging to form a bioelectret, then an organic ferroelectric piezoelectric material is taken as a matrix to prepare a highly oriented fiber reinforced film, the highly oriented fiber reinforced film is covered on the bioelectret to simulate an extracellular matrix of a natural cell, the technical parameters of electrostatic spinning are controlled by regulating the mixing proportion of organic and inorganic materials so as to prepare the highly oriented elastic fiber film, the flexibility and the biocompatibility of the material are improved, the luminous intensity of elastic stress is improved, and the stress visual composite film can be applied to the fields like treatment of the cancer and the tumor, biological imaging, stress distribution visualization, and detection of stress damage, and can also be applied to other different fields like preparation of various sensors, man-machine intelligent interaction and the like.