The present invention relates to a plus or minus 800 kV/5000 MW flexible DC converter valve post type valve tower structure. The plus or minus 800 kV/5000 MW flexible DC converter valve post type valve tower structure comprises multiple layers of valve segments and multiple segments of post insulator structures, the multiple segments of post insulator structures support and fix the multiple layersof valve segments, each layer of valve segments is composed of a plurality of valve segments, and each valve segment comprises a frame and a power module. The power module is fixed in the frame, theframe is composed of more than three sets of supporting parts, and each set of supporting parts is composed of the upright columns, the cable-stayed supports, transverse supporting beams and the longitudinal supporting beams. The transverse directions between the upright columns are fixed by the upper and lower two transverse supporting beams, the upper and lower two transverse supporting beams are fixed by the longitudinal supporting beams, and the cable-stayed supports are fixed between the longitudinal supporting beams and the upright columns. The advantages are that the overall structure is compact, the floor space reduces by 25% by being compared with a conventional form, and by a frame reinforcement structure, the interconnecting box irons between the supporting insulators satisfy the 8-intensity anti-seismic requirements, and the integrality of the valve segment structures and the stress distribution uniformity and stability are improved.