The invention provides a heavy load full formwork support system, which comprises a plurality of vertical rods and a plurality of horizontal rods, wherein each vertical rod consists of a steel pipe, circular end plates, an enhancing sleeve pipe, a fixing inserting groove and a sliding inserting groove, each steel pipe has certain length modulus, the circular end plates are fixedly arranged at the two ends of the corresponding steel pipe, a bolt hole is formed in each circular end plate, each enhancing sleeve pipe is welded at the connecting part of the vertical rods and the horizontal rods, each fixing inserting groove is welded at one side of the corresponding enhancing sleeve pipe, each sliding inserting groove is positioned between the corresponding circular end surface and the corresponding fixing inserting groove, and can slide along the corresponding vertical rod, each fixing inserting groove and each sliding inserting groove respectively comprise four inserting grooves, the inserting grooves are uniformly, vertically and correspondingly arranged along the annular direction, and are used for connecting the four longitudinal and transverse horizontal roads, each horizontal rod consists of a steel pipe and two inserting plate, each inserting plate is arranged at the end part of the corresponding steel pipe, and each inserting groove is matched with the corresponding inserting plate at the end part of the corresponding horizontal rod. The heavy load full formwork support system has the advantages that the safety and reliability are realized, the building is convenient and rapid, and the bearing capability is high.