The invention relates to a shredder, in particular to an office shredder in order to achieve the technical effects that the office shredder is complete in breaking and good in confidentiality. To achieve the technical effects, the office shredder comprises a box body and the like; the lower part of the front side of the box body is connected with a box door through hinged flaps; a material puttinghopper is arranged in the middle of the top of the box body, and communicates with the box body; a material containing frame is arranged at the bottom in the box body; the middle part in the box bodyis connected with a material receiving hopper; a breaking device and a material transmission device are arranged at the upper part in the box body; and the material transmission device is located above the breaking device, and is matched with the breaking device. Through the material transmission device, paper is taken onto the breaking device and is broken by the breaking device, a material pressing device presses the broken paper into water in the material containing frame and the paper is soaked to be broken, thus the effects of completeness in breaking and good confidentiality are achieved.