A multi-purpose skate comprising a skate body and a skating device, the bottom of the skate body has a front and a rear fixing seat, the two fixing seats both have several longitudinally extending engaging structures, and each has at least a transverse first hole. The skating device can be one with rollers for an inline roller skate, one with a metallic blade, or one with a ski, and is provided on its top with a front and a rear positioning portion; the two positioning portions at least each has a transverse second hole. When the positioning portions are respectively connected with the engaging structures on the bottom of the skate body, locking members are extended through the first and the second holes to combine the fixing seats together with the positioning portions; the skate body and the skating device thus can be detached after removing the locking members.