The invention relates to a constant-pressure elastic device for aligning and bonding a
glass prism, which belongs to the technical field of
satellite assembly and measurement, and comprises a
glass prism, a
prism adhesive, a
prism bracket, a lead screw device, a plurality of first fasteners and a tool body, wherein the two sets of orthogonal lead screw devices are installed on an installation platform of the tool body through first fasteners, and the
prism support is installed on a datum plane of the tool body through the first fasteners; a
glass prism is bonded on a prism mounting surface of a prism support through a prism
adhesive, then the glass prism is pressed on a
reference surface of a tool body through two sets of orthogonal lead screw devices, the tool body is matched with the lead screw devices through five-surface cooperative positioning, and position deviation caused by
adhesive rebound is prevented; according to the device, the tool body serves as a main body structure, and the high-precision optical characteristic of the glass prism is utilized to assist in establishing a
satellite measurement reference, so that the accuracy of installation and inertial measurement of instrument equipment on a
satellite and
observation data of a space instrument is improved.