The invention discloses a BOP (Blow Off Preventer) shifting and transporting device for a jack-up offshore platform. The BOP shifting and transporting device comprises a main body frame, wherein a rolling wheel assembly A is arranged on the lower edge of each of two ends of the main body frame; the main body frame is glidingly connected with a main guide rail arranged on a cantilever through the rolling wheel assemblies A; the upper end surface of the main body frame is provided with an upper guide rail; a moving trolley is arranged on the upper guide rail; a telescopic arm and two groups of lifting oil cylinders are hung on the lower end of the moving trolley; the end parts of downwards extending and retracting piston rods of the two groups of lifting oil cylinders are hinged to a tray, and meanwhile, the tray is connected with the lower ends of the telescopic arm; the lower end surface of the main body frame is additionally provided with a lower guide rail, and the lower guide rail downwards extends to be lower than the cantilever; the lower guide rail downwards extends to be glidingly connected with a connecting frame through rolling wheel assemblies C; the rolling wheel assemblies C are fixedly arranged on the upper end surface of the connecting frame; and the side surface of the connecting frame is fixedly connected with the side surface of the telescopic arm. The BOP shifting and transporting device has the advantages of high operation efficiency, stability and reliability.