The invention discloses a glass cutting device. The includes a placement plate, fixed blocks are disposed on both sides at the top of the placement plate, one mutually closer side walls of the two fixed blocks are respectively equipped with a sliding chute, first motors are fixed on one end side walls of the fixed blocks through screws, output shafts of the first motors are connected to threaded rods, the threaded rods are rotatably connected in the sliding chutes and are in threaded connection with sliding blocks, the sliding blocks are slidably connected in the sliding chutes, the two sliding blocks are connected by a cross bar, a gear rack is disposed at the top of the cross bar, the cross bar is externally sleeved with a movable frame, a second motor is fixed on one side wall of the movable frame through a screw, an output shaft of the second motor is connected to a gear located inside the movable frame, and the gear is engaged with the gear rack. The glass cutting device provided by the invention can drive a cutting head to do up, down, left, right, front and back multidirectional movement so as to cut glass into arbitrary shape, and the cutting effect is good.