Upper plate clamp for machining spherical special-shaped mirror

The invention discloses an upper disc clamp for machining a spherical special-shaped mirror. The upper disc clamp comprises a connecting bottom plate, an upper disc clamp body, the spherical special-shaped mirror and a spherical mirror gasket. The connecting bottom plate is provided with four positioning T-shaped through holes, a positioning circular through hole and a plurality of equally-divided square grooves, the connecting bottom plate and the upper plate clamp are locked by screws through the positioning T-shaped through holes, and the eccentricity of the spherical special-shaped mirror is controlled by controlling the parallelism of the connecting bottom plate; the upper disc clamp is provided with four positioning threaded holes, a protruding positioning circular connector, a circular groove and equally-divided square through holes, the number of the square through holes is the same, the size of the square through holes is slightly larger than that of the square grooves in the connecting bottom plate,