The invention discloses a supporting platform device. According to the supporting platform device, the bottom of a supporting plate at least can be provided with three height regulating brackets, wherein the top ends of the height regulating brackets are fixed on the supporting plate, and the bottom ends of the height regulating brackets are provided with sucking discs; each height regulating bracket is provided with a height coarse regulating bolt and at least one height fine regulating bolt, and a height required by a mounting specification of equipment to be mounted can be reached by regulating the height coarse bolts; and then the height fine regulating bolts are regulated by combining an observation horizontal position until reaching the height required by the equipment mounting and a horizontal state. According to the supporting platform device, height coarse regulating is carried out on the equipment to be mounted through the coarse regulating bolts, and then height fine regulating is carried out on the equipment to be mounted through the fine regulating bolts, so that the requirement on the mounting precision of the equipment is met.