The invention discloses a crane. The crane comprises a base; two sides of the bottom of the base are movably connected with rollers through brackets; the right side of the base is fixedly connected with a controller; two sides of the top of an inner cavity of the base are fixedly connected with support devices; the support devices comprise hydraulic cylinder bodies; first elongation rods are inserted in inner cavities of the hydraulic cylinder bodies; the bottoms of the first elongation rods penetrate through the hydraulic cylinder bodies and the base in sequence from top to bottom, and extend to the bottom of the base; and second elongation rods penetrate in inner cavities of the first elongation rods. In the crane, the second elongation rods drive the first elongation rods to upwards move, so that second connecting plates and the support plates are shifted into a storage box for storage; and the whole device is simple in operation and convenient to use, can be used for supporting the crane on an uneven pavement, has no need to cushion such other objects as flat plates on the pavement to increase the contact area with the ground, and saves the manual operation.