The invention discloses a step type clamping structure which comprises a clamping block and a clamping hole column, wherein the clamping block is a right triangle block; a plurality of continuous push teeth are arranged on the slope of the clamping block; a right trapezoid hole for the clamping block to penetrate is arranged on the clamping hole column; and the clamping block radially penetrates through the right trapezoid hole of the clamping hole column and is meshed with meshing teeth of the clamping hole column by the push teeth. The thickness of a plate decides the mesh of different pushteeth on the clamping block with the meshing teeth on the clamping hole column; when the plate is thicker, the meshing teeth at the front end of the clamping block are meshed with the meshing teeth on the clamping hole column; when the plate is thinner, the meshing teeth at the rear end of the clamping block are meshed with the meshing teeth on the clamping hole column; and finally, two plates are compressed between the bottom plane of the clamping block and the upper end surface of the terminal of the clamping hole column. The invention has the advantages of simple structure and convenience of installation, can be used for connection between plates with different thickness and is especially suitable for connection between the plates without disassembly after installation.