FIELD : chemistry.SUBSTANCE : invention relates to composite polymer materials based on cellulose and polyesters and can be used for production of biodegradable composites used in medicine, for production of packing articles, containers, as well as in space, aviation and many other industries. Narrower field of the invention is composite polymer materials based on cellulose and polyalkylcalactone. Composite biodegradable material is a polymer composition containing cellulose as a reinforcing material, and grafted polyester binder of mesh structure is polyangalicalactone in following ratio of components, wt.?% : polyangelalactone - 20–70; cellulose is the rest.EFFECT : technical result consists in high strength properties of composite material and its relatively fast biodegradation.1 cl, 10 ex