The invention relates to a minisize resistance-type displacement meter based on a full-bridge electrometric method, belonging to the technical field of geomechanical model tests. The minisize resistance-type displacement meter mainly comprises a thin copper sheet, a test bolt, a protective shell, four strain sheets, lead wires and a perforated base, wherein the test bolt is fixed on the upper end of the thin copper sheet; the intermediate part and the lower end of the thin copper sheet are arranged in the protective shell; the relative positions of two side surfaces of the intermediate part of the thin copper sheet are adhered with the four strain sheets; the lower part of the thin copper sheet and the base are fixed together; and the four strain sheets are respectively connected with the lead wires to form a full-bridge circuit. The minisize resistance-type displacement meter disclosed by the invention can be used for measuring the displacement of the surface of a dam body or the inside of the a rock body, has the characteristics of minisize, light weight, high sensitivity and good stability and is especially suitable for the geomechanical model tests.