The invention discloses a surface-mounted ZnO piezoresistor and a preparation method therefor. Silver electrode slurry is printed on the two surfaces of a ZnO voltage-sensitive ceramic sheet, and is sintered to form a silver electrode to obtain a ZnO voltage-sensitive silver sheet with silver electrodes on the two surfaces; a layer of annular insulating material is prepared on the edges of the silver electrodes on the two surfaces to prepare a ZnO piezoresistor sheet covered with an insulating material; a metal electrode sheet with a concave position and flat bottom parts positioned on the two sides of the concave position is manufactured; soldering paste is printed in the center of the silver electrode on one surface of the ZnO piezoresistor sheet covered with the insulating material, and the center of the concave position of the metal electrode sheet is aligned to the central position of the printed pattern of the soldering paste, and the soldering paste is molten by heating to form a soldering tin layer; and the metal electrode sheet and the ZnO piezoresistor sheet are welded together through the soldering tin layer. Different from the existing stacking process, the patch type piezoresistor manufacturing method adopts the single-layer voltage-sensitive ceramic sheet, so that the manufactured patch type piezoresistor is high in absorption energy density and low in manufacturing cost.