Double-layer two-dimensional code and anti-counterfeiting or/and capacity-enlarging method based on same

Disclosed are a double-layer two-dimensional code and an anti-counterfeiting or/and capacity-enlarging method based on the same. The double-layer two-dimensional code comprises a transparent printing stock and a base material, a transparent glue layer is arranged on one side of the transparent printing stock, a flexible photosensitive resin layer is arranged on one side of the base material, the transparent printing stock is pasted on the flexible photosensitive resin layer via the transparent glue layer, a first matrix-type two-dimensional code part containing first information is printed on the surface of the transparent printing stock, white transparent portions in the first matrix-type two-dimensional code part are exposed to be a second matrix-type two-dimensional code part containing second information by a cold light source, and the first matrix-type two-dimensional code part and the second matrix-type two-dimensional code part complement each other in shape within an area occupied by the matrix-type two-dimensional code. Under the condition that occupied area and structure of an existing matrix-type two-dimensional code are not changed, information capacity of the matrix-type two-dimensional code can be enlarged, or/and the two-dimensional code is enabled to have the advantage of an anti-counterfeiting function.