The invention relates to a mechanical rapid dismounting and mounting device for a rubber soft joint. The hydraulic rapid dismounting and mounting device for the rubber soft joint comprises a rack and a work platform which is mounted on the top of the rack and transversely arranged and is characterized in that an opening is formed in the work platform, a hydraulic oil cylinder is arranged at the position, under the opening, of the rack, a hydraulic station used for driving the hydraulic oil cylinder to move is mounted on the rack, a steel wire ferrule is mounted at the top end of a piston rod of the hydraulic oil cylinder, a flange disc mounting positioning mechanism is arranged on the opening of the work platform, and a flange disc dismounting positioning mechanism is arranged at the position, located on one side of the opening, of the work platform. The mechanical rapid dismounting and mounting device has the beneficial effects of being simple in structure, convenient to use, labor-saving in operation and high in work efficiency.