The utility model discloses a pressurization fixing device for on-site cementing remanufacturing of a metal structure of a crane. The device comprises a crank, a cylinder body, a plurality of fixed supporting legs, an adjusting bolt, an adsorption device, a lead screw, a rotating shaft, a base and a rubber block, the bottom of the cylinder body penetrates through the base and is fixedly connectedwith the base; wherein the lead screw penetrates through the cylinder body and is in threaded connection with the cylinder body, the top end of the lead screw penetrates out of the upper end of the cylinder body and is connected with the crank, the bottom end of the lead screw penetrates out of the lower end of the cylinder body and is connected with the rubber block, each fixed supporting leg ishinged to the base through the rotating shaft, and each fixed supporting leg is connected with one adsorption device through the adjusting bolt. The device is simple in structure and convenient to use.