Abstract: One type of modular cabinet frame structure is primarily made up of two square cross sectional tubes with three connectors; the surfaces of the two tubes are equipped with inset joining grooves to meet the needs of different types of arrangements; the interior of the tubes are equipped with projecting strengthening ribs for upright structures that cause the center of the hollow interior of the tubes to overlap with the center of the tubes. The connectors consist of square units upon the surface of which are mounted three, four or five tenon posts that can be inserted in the tubes described above and form different types of connections in various directions.