The invention discloses an outer anchoring structure of a cable-stayed bridge tower body. The outer anchoring structure of the cable-stayed bridge tower body comprises two concrete tower columns, and steel beams are arranged between the two concrete tower columns; the outer anchoring structure further comprises a plurality of transverse partition plates, the transverse partition plates are arranged on the steel beams in the transverse direction of a bridge, and cable tower connecting anchoring boxes are arranged between the adjacent transverse partition plates. By means of the outer anchoring structure, the defect that concrete tower walls are prone to tension cracking in other cable-tower anchoring modes can be effectively overcome, pre-stress of the cable-tower anchoring position is omitted, the problem that as the cable-tower anchoring structure is arranged, vertical stressed reinforcing steel bars of a main tower are snipped is solved, and the continuity of main tower reinforcing steel bars is guaranteed. The outer anchoring structure of the cable-stayed bridge tower body is simple and clear in force transmitting path, reasonable in stressing and safe and reliable in design, and has quite high applicability in the large-span cable-stayed bridge.