This　paper　proposes　a　visual　image　encryption　algorithm　based　on　2D　compressive　sensing　and　variable　threshold　secret　sharing,　aiming　to　achieve　efficient,　secure,　and　flexible　image　encryption　and　decryption.　Firstly,　the　plain　image　is　compressed　and　encrypted　using　the　2D　compressive　sensing　technique,　while　the　measurement　matrix　and　disordered　sequence　are　generated　through　an　improved　chaotic　system.　Secondly,　the　shadow　image　is　produced　using　the　variable　threshold　secret　sharing　scheme,　and　a　corresponding　authentication　signature　is　generated　to　verify　the　integrity　and　authenticity　of　the　shadow　image.　Finally,　the　shadow　image　and　its　signature　are　embedded　into　a　carrier　image　to　generate　a　cipher　image　with　visual　steganography.　Experimental　results　demonstrate　that　the　proposed　algorithm　achieves　excellent　performance　in　terms　of　operational　efficiency,　visual　encryption　quality,　and　decryption　performance.　The　encryption　execution　time　is　0.694　s,　the　PSNR　of　decrypted　images　is　approximately　32　dB,　and　the　PSNR　of　cipher　images　is　around　42　dB,　ensuring　high　visual　concealment　and　reconstruction　quality　while　maintaining　security.