The invention discloses an identity information authentication based high information security public paper shredding system, a device and a method. The system includes a control unit, a paper shredding unit, an identity acquisition unit, an identity authentication unit and an electronic locking unit. The control unit sends out locking control information according to identity legal information and locking request information, controls the locking of a wastepaper storage box, and controls a paper shredder according to paper shredding control information in terms of carrying out paper shredding operation. The way for controlling unlocking of the wastepaper storage box by the control unit includes that: A. after the paper shredder carries out paper shredding operation, the control unit sends unlocking control information to the electronic locking unit, and the electronic locking unit relieves the locking state to the wastepaper storage box; and B. the control unit sends unlocking control information according to identity matching information and unlocking request information to control unlocking of the wastepaper storage box. The system, device and method provided by the invention are based on information authentication, effectively improve the safety and reliability of the paper shredder, also realize unattended operation, and improve the office efficiency of users.