Spigot-and-socket interface structure of sheet material

The utility model provides the insertion-typed interface structure of a plate. The utility model is characterized in that flanging is arranged at two connected sides of a plate or two connected side edges of two plates; the flanging, from the edge to the inside of the plate, sequentially consists of a first bevel edge with the angle with the plate surface less than 90 DEG, a first straight edge parallel to the plate surface, and a second bevel edge with the angle with the plate surface less than 90 DEG; all sections of the flanging are connected end to end; the oblique directions of the first bevel edge and the second bevel edge are reverse, and the two bevel edges and the first straight edge together constitute a coattail-shaped section; when the side edges of the two plates with the flanging are inserted mutually for connection, an angle-shaped convex fold formed by the first bevel edge and the first straight edge at the edge of a plate side is inserted in an angle-shaped concave trough formed by the first