The invention relates to the technical field of environment-friendly machinery, in particular to an environment-friendly waste paper smashing device which comprises a shell and an inner container, the inner container is arranged in the shell and fixedly connected with the top face of the shell, a feeding port communicated with the shell is formed in the top face of the inner container, a discharging port is formed in the bottom face of the inner container, and the inner container is provided with a smashing mechanism. A discharging mechanism is arranged at the position, located below the inner container, in the shell, an extrusion mechanism is arranged below the discharging mechanism, by arranging the discharging mechanism, paper scraps which are smashed evenly can enter the extrusion mechanism, large paper scraps which are smashed unevenly enter the inner container again, and the large paper scraps are smashed again through the crushing mechanism. Therefore, the waste paper is thoroughly crushed, and the device has the advantage of good crushing effect. Through the arrangement of the extrusion mechanism, the crushed paper scraps can be subjected to briquetting treatment, so that the size of the paper scraps is greatly reduced, and subsequent transportation and treatment of the waste paper scraps are facilitated.