Biodegradable composite paper, preparation method thereof and packaging paper

The invention relates to the technical field of packaging paper, in particular to biodegradable composite paper, a preparation method thereof and packaging paper. The biodegradable composite paper is composed of a paper base layer, an adhesive layer and a film layer which are sequentially arranged from bottom to top, wherein the paper base layer and the film layer are compounded through the adhesive layer to form biodegradable composite paper; and the film layer is made of a biodegradable material. The biodegradable composite paper provided by the invention is simple in structure, the biodegradable composite paper can be used for directly printing ink on the film layer according to the requirements of customers on printed patterns so as to obtain packaging paper, and the delivery time is greatly shortened. After the ink layer and the oil layer are printed on the surface of the biodegradable composite paper, the obtained packaging paper does not have the problem of layer separation and whitening, so that the q