Quantum　image　processing　has　great　significance　as　a　branch　of　quantum　computing.　This　paper　gives　a　quantum　image　encryption　based　on　Henon　mapping,　which　breaks　away　from　the　restriction　of　classical　computers　and　does　the　work　in　quantum　computers　end　to　end,　including　the　generation　of　the　chaos　sequence,　the　encryption　and　the　decryption.　The　algorithm　is　based　on　the　GQIR　quantum　image　representation　model　and　the　two-dimensional　Henon　chaotic　mapping.　However,　the　decimal　sequence　generated　by　Henon　mapping　can　not　be　directly　applied　to　quantum　computers.　Hence,　we　reform　the　Henon　mapping　by　binary　shift.　The　quantum　image　is　encrypted　by　being　XORed　with　the　quantum　Henon　mapping.　Simulation　experiments　indicate　that　the　encrypted　image　has　good　radomness　and　the　pixel　values　are　evenly　distributed.　Since　the　chaotic　sequence　itself　is　suitable　for　image　encryption,　coupled　with　its　own　quantum　confidentiality,　the　encryption　method　of　this　paper　is　safe,　convenient　and　reliable.