Sheet trimmer

The utility model relates to a trimmer, in particular to a sheet trimmer for plastics machinery. The sheet trimmer comprises a slicing rack; a pair of trimming mechanisms arranged in a spaced manner are arranged in the slicing rack; a trimming gap forms between the trimming mechanisms; aluminum carrier rollers distributed in a manner of matching with the trimming mechanisms are disposed at two ends of the slicing rack, respectively; a trimming rack mechanism comprises an upper moving cutter rest, a lower moving cutter rest and an adjusting screw; the upper moving cutter rest and the lower moving cutter rest are separately screwed to the adjusting screw; an upper disc cutter is arranged on the inner wall of the upper moving cutter rest; a lower disc cutter distributed in a manner of matching with the upper disc cutter is disposed on the lower moving cutter rest; the lower moving cutter rest moves along the adjusting screw through a cylinder. The sheet trimmer is compact in structure, higher in operating precision, simple to operate and highly adaptive.