The invention discloses a cement feeding device with a manual cutting knife. The cement feeding device comprises a cement placing box, a pipeline and an air sucking device. One end of the pipeline isconnected with the cement placing box, and the other end of the pipeline is connected with a connecting flange. The air sucking device is arranged on the pipeline. An opening is formed in the cement placing box, and the opening is provided with a drawer device. When the drawer device is closed, the opening is sealed; and the cement placing box is further internally provided with the manual cuttingknife. The manual cutting knife comprises a cutting knife body, a spring and a handle. According to the cement feeding device, the cement placing box is arranged, and cement is sucked in a stirring tank through the air sucking device, so that dust can be reduced; and by arranging a drawer on the cement placing box and arranging the cutting knife in a drawer area, when the drawer is pulled open, the whole package of cement is put into the drawer, and a cement package is cut by pressing the manual cutting knife while the drawer device is closed, so that the cement package is opened.