This is a Centurion tank equipped with SS.11 missiles. https://the-other-lexington.tumblr.com/post/143954764743/centurion-tank-with-ss11-anti-tank-missiles/amp appears to be the source for this image. See also https://wiki.warthunder.com/Strv_81_(RB_52)

tl;dr- older tank armed with anti-tank missiles for increased range.