The invention discloses a fully-automatic numerical control composite inner surface grinding machine, and belongs to the technical field of composite grinding machines. The fully-automatic numerical control composite inner surface grinding machine comprises a machine body, a servo driving mechanism and a workpiece conveying mechanism, and the workpiece conveying mechanism comprises a feeding channel, a material stopping channel, a workpiece pushing assembly and a discharging channel; workpieces pass through the feeding channel and the material stopping channel and reach a grabbing station of the workpiece pushing assembly, the workpiece pushing assembly pushes the workpieces to a machining station for being ground; the ground workpieces are output through the discharging channel, and the feeding channel, the material stopping channel and the discharging channel are formed by enclosing of baffles, and the positions of the baffles can be adjusted; and the servo driving mechanism comprises a workpiece feed motor, a drag plate, a magnetic chuck and a grinding wheel, the magnetic chuck is arranged on the drag plate, the workpiece feed motor drives the drag plate to move in the horizontal direction, the magnetic chuck moves to the workpiece machining station, and the workpieces are adsorbed and fixed. The fully-automatic numerical control composite inner surface grinding machine canrealize automatic circulation of the whole process of feeding, machining and discharging, the material channels can be conveniently adjusted to adapt to the conveying requirement of the workpieces with the different sizes, and the good adaptability is achieved.