A slide mechanism for use in elevation device comprises: a support seat, longitudinally disposed with at least three wing pieces spaced from each other, wherein at least one lateral surface of each of the wing pieces is respectively and longitudinally pivoted with at least one roller, one of the wing pieces is extended with a neck part having a front end disposed with a connection arm; and a sleeve, having a circumference defined at the top end longitudinally formed with a rail slot, wherein an inner circumference thereof is longitudinally formed with a positioning slot at a location corresponding to the at least one rollers and allowing a guide rail to be disposed and positioned, an outer circumference of each of the rollers is formed with a guide slot sleeved in the guide rail, so that the rollers can be respectively and longitudinally slid along the corresponding guide rail.