A detachable three-dimensional beam column structural method belongs to a building technology. According to the principle of steady and reliability and convenient disassembly and assembly, junctions are divided into a plurality of mutually-engaged units and respectively arranged on each beam column and bolt locks, buckle locks and anchor ears are arranged, so a beam column structural method of mutually-locked tongue and grooves with respective codes is formed. The detachable three-dimensional beam column does not need screws and nuts and welding, can be freely disassembled and assembled and repeatedly used, has the characteristics of light weight, high intensity and working efficiency, expense saving, steady and reliable structure, energy saving and environmental protection and is suitable for building various temporary facilities in the construction field, temporary scenes, retaining walls, viewing decks, billboards, and the like.