The invention discloses a truss type non-strut hydraulic climbing formwork system. The system comprises an inner formwork body, an outer formwork body, an upper truss body, a hydraulic system, a hydraulic platform, a bearing triangle support, a plurality of embedded parts and a plurality of wall-attaching hanging pedestals, wherein the embedded parts are mutually matched with the wall-attaching hanging pedestals. The upper truss body comprises five groups of horizontal type steel trusses and a vertical main truss, wherein the five groups of horizontal type steel trusses are arranged on the outer ring of the outer formwork body, the vertical main truss is used for making the five groups of horizontal type steel trusses connected into a whole, each group of horizontal type steel trusses is composed of multiple structural steel trusses, and the number of the structural steel trusses in each group is identical, and the angular points of every two adjacent structural steel trusses in the same group of horizontal type steel trusses are fixed by oppositely pulling two connecting steel bars. Ventilation holes in the side face (large face) of a cable bent tower serve as strut preformed holes, deformed steel bars oppositely penetrate through the ventilation holes so as to fix the inner formwork body and the outer formwork body, so that the non-strut design of a formwork is achieved, strut holes in the concrete face of a tower column are eliminated, the corrosion channels of tower column steel bars are reduced, and then the quality of the tower column concrete is improved. The invention further provides a construction technology of the truss type non-strut hydraulic climbing formwork system.