To recover a polyethylene refined flake by removing a deposit such as a residual oxidized oil, mud, soil, sand and refuse from a spent edible oil packaging container made of a thermoplastic resin.

A method for recovering the spent edible oil packaging container made of the thermoplastic resin comprise a step of comminuting the container made of the resin together with a comminuted cellulose material, and a step of giving an impact grinding force to the comminuted individual small pieces to be treated to a resin material and a deposit such as the cellulose comminuted material adsorbing the residual oil such as wood chips or the like and granulating the resin material.