Abstract: Plastic film covering technology has been widely used in agricultural production, but with increasing number of years and areas covered with plastic film, residual plastic film has brought serious pollution to environment．At present, mechanized recovery is an effective technical means for treating residual film pollution．An in-depth analysis of existing patent information for mechanized recovery of residual film was conducted, and development trend of mechanized recovery technology of residual film was elaborated from aspects of application time, application area, patent holder type, and technical characteristics．Main reasons for patent invalidation and phenomenon of patent invalidation among different applicants were analyzed．Propose suggestions for promoting development of mechanized recovery technology for residual film were put forward based on existing patent technology hotspots and development trends．