The invention relates to a supporting device for heliostats, which comprises a vertical prop (14), a main body (12) of the supporting device and a supporting carrier (11) for a reflecting surface unit, the supporting carrier (11) for the reflecting surface unit is installed in a single point supporting type on a fixing component (31) of the main body (12) of the supporting device, a positional coordinate of the fixing component (31) is determined by a spotlight curved surface of a reflecting surface, a central axle of the fixing component (31) is coincided with a normal line which is located on the central point portion of the reflecting surface unit (16), and comparatively precise installing references or referencing positions are provided for an installment of the supporting carrier (11)for a reflecting surface. A pasting camber of the supporting carrier (11) is coincident with a face type of the reflecting surface and formed through a machining method, thereby face type accuracy ofcambers can be increased.