The invention relates to a device for measuring the displacement of a main distributing valve core of an anti-electromagnetic interference and anti-zero drift governor. The device comprises a main distributing valve sleeve, the main distributing valve core, a main distributing displacement upper measuring circular table, a main distributing displacement lower measuring circular table, a main distributing displacement measuring bracket, an upper main distributing displacement sensor probe and a lower main distributing displacement sensor probe. The main distributing displacement measuring bracket is arranged on the end cover of the main distributing valve sleeve. The main distributing displacement upper measuring circular table and the main distributing displacement lower measuring circulartable are fixedly arranged outside the main distributing valve sleeve on the main distributing valve core. Through core holes which match the outer part of the main distributing valve sleeve on the main distributing valve core are arranged in the axial center of the main distributing displacement upper measuring circular table and the main distributing displacement lower measuring circular table.According to the invention, the influence of a temperature drifting effect and an electromagnetic interference signal during the measurement process of the displacement signal of the main distributing valve core can be eliminated, and the displacement signal of the main distributing valve core can be accurately measured and collected.