The present invention discloses an image encryption method based on a constructed two dimensional reversible cellular automaton, and belongs to the image encryption technology field. The image encryption method of the present invention comprises the steps of generating a set of pseudorandom sequence based on the size of a to-be-encrypted image, converting into a corresponding two dimensional pseudorandom matrix K0, and taking an xor result of the two dimensional pseudorandom matrix K0 and an image matrix as an initial encryption image matrix S1, carrying out the binary conversion on the initial encryption image matrix S1 to obtain a state C1, and generating a corresponding binary pseudorandom sequence matrix and using as an original state C0; taking the states C0 and C1 as the evolution initial conditions, based on the preset two dimensional reversible cellular automaton rules f1 and f2, carrying out the evolution processing to obtain the states, then taking the states as the evolutioninitial conditions, carrying out the second round of evolution processing to obtain the states, and carrying out the pixel value conversion processing on the states to obtain a ciphertext image. According to the present invention, only the complex or disordered rules of better encryption performance are adopted to carry out the evolution processing, at the same time, by the two rounds of two dimensional reversible cellular automaton encryption, the encryption safety is improved further.