Full-diameter paper roll shearing device

The utility model provides a full-diameter paper roll shearing device. The full-diameter paper roll shearing device comprises a rack, a shearing table, a cutter device and a conveying belt device. The cutting knife device comprises a cutting knife and a cutting knife driving mechanism, the cutting knife comprises a cutting knife support and a cutting knife, the cutting knife is fixed on the cutting knife support, the cutting knife support is arranged on the rack in a manner of moving up and down and is positioned above the cutting table, and the cutting knife driving mechanism is arranged between the rack and the cutting knife support; the cutter is longer than the paper roll and wider than the diameter of the paper roll; a vertically-through paper falling hollow structure is arranged on the shearing table, and a paper roll supporting structure is arranged on the shearing table. The shearing table is arranged on the rack, and a channel for the cutter to pass through is arranged on the shearing table; the conv