The invention provides an angle adjustment device for a heliostat. The angle adjustment device comprises a supporting table and a rotating shaft sleeve. A connecting supporting lug is fixedly connected to one side of the supporting table and hinged to an electric push rod. Two bearing pedestals with oilless lubrication bearings are fixedly connected to the upper end of the supporting table. The rotating shaft sleeve is matched with the two oilless lubrication bearings at the same time. A connecting piece is fixedly connected to the outer side wall of the rotating shaft sleeve. The connecting piece is hinged to the output end of an electric push rod. The angle adjustment device for the heliostat is compact in structure and long in service life. The dustproof effect is ensured, the device can work normally under the severe environment of -28 DEG C-50 DEG C. The maintenance frequency of a lubrication system is greatly decreased, and the maintenance cost is reduced. The angle adjustment device is smooth in transmission, reliable in output and low in noise, has the self-locking function, and can rapidly assemble, disassemble and maintain the rotating shaft sleeve through installation structures of the upper and lower bearing pedestals.