The invention relates to a machining method of a T-shaped movable beam irregularly-shaped glass machining glass. The T-shaped movable beam irregularly-shaped glass machining glass consists of a gantry framework, a fixed platform, a transverse stepper / servo mechanism, an X-axis screw rod, an X-axis lead rail, a T-shaped longitudinal stepper / servo mechanism, a Y-axis screw rod, a Y-axis lead rail, an upper stepper / servo mechanism, a lower stepper / servo mechanism, a Z-axis screw rod, a Z-axis lead rail, a grinding head mechanism, a positioning adsorption disc, a control box, a polishing grinding wheel, a fine grinding heel and a coarse grinding wheel; the T-shaped longitudinal stepper / servo mechanism moves along the Y-axis direction of three Y-axis lead rails, and a three-axis linked data control system is used for machining the irregularly-shaped glass; and a T-shaped movable beam adopts an integral framework structure, the rigidness of the T-shaped movable beam is good, the stability is good, and the T-shaped movable beam is not deformed when being ground under a large torque, the three lead rails are used as support, so that the T-shaped movable beam is faster to run in the running process, more stable to run and better in synchronous effect, the working efficiency is efficiently improved, and the dimensional precision of a final product can be improved.