Friction pendulum seismic mitigation and isolation support shear device convenient to disassemble and assemble

The utility model relates to an accessory structure of a friction pendulum seismic mitigation and isolation support, in particular to a friction pendulum seismic mitigation and isolation support shear device convenient to disassemble and assemble. Comprising an upper seat plate, a middle plate and a lower seat plate, the middle plate is in spherical surface fit or cambered surface fit with the lower seat plate and the upper seat plate, and the lower seat plate and the upper seat plate are in positioning connection through a shear ring or a shear barrier strip and a shear component; a connecting block is arranged on the outer side of the upper seat plate, the shear component penetrates through the shear ring or the shear barrier strip to be connected with the connecting block, the connecting block is arranged on the inner side or the outer side of the limiting plate, and the connecting block and the limiting plate are fixedly assembled or integrally formed and then connected with the upper seat plate through a