The utility model discloses a straight comb, the comb main part includes the casing, is equipped with the moving plate on the casing, is equipped with the comb tooth on the moving plate, is equipped with the adjusting groove on the back of casing, is equipped with the adjusting plate in the adjusting groove and slides, is equipped with the adjusting block in the bottom of adjusting plate, one side of adjusting block is equipped with the adjusting lever, is equipped with the adjusting slide on the adjusting lever, is provided with the inclined groove of cooperation with adjusting slide on the moving plate, through adjusting plate drive adjusting block, adjusting lever and adjusting slide remove, through the cooperation of adjusting slide and inclined groove, the height of moving plate comb tooth is adjusted conveniently, and then the comb tooth is recovered when not using conveniently, prevents the comb tooth damage.