The invention relates to a low-position few-fulcrum modularized integral jacking steel platform formwork system. A supporting upright column of the system is a standardized lattice column and comprises an upper bearing beam connected with a steel platform, a lower bearing beam connected with an upper supporting cross beam and a lattice column main body connected between the upper bearing beam and the lower bearing beam, the lattice column main body comprises four column limbs, and each column limb is formed by splicing standard segmented column limbs one by one in an end-to-end connection mode through bolts. A jacking cylinder of the system is inverted and penetrates through the upper supporting cross beam main body from bottom to top. The steel platform of the system is an assembly type changeable steel truss platform and comprises main stressed trusses, auxiliary stressed trusses and support bars between the trusses. A pylon of the system is an adjustable pylon and comprises a skeleton and a steel spring board fixed on the skeleton. The formwork system realizes the modularization of each assembly and the standardization of operations, can be repeatedly and circularly used on different buildings and can be adjusted along with the height of the buildings. Moreover, the formwork system can effectively reduce construction cost, reduce construction difficulty and increase working efficiency.