The invention relates to the technical field of electric spark processing, in particular to a slow wire feeding electric spark processor. The slow wire feeding electric spark processor comprises a fixed shell, a lifting mechanism, a first moving mechanism, a second moving mechanism, a rotating mechanism, an impurity removing mechanism and an electric spark mechanism. A workpiece can be driven by the lifting mechanism, the first moving mechanism and the second moving mechanism to move freely on X-axis, Y-axis and Z-axis directions, and the workpiece is cut conveniently from multiple directionsby means of wire electrode spark discharge, so that the demand on the workpiece is reduced. The workpiece is finally mounted and fixed on a mounting head of the rotating mechanism, and the workpiece can rotate by means of the rotating mechanism to be cut rotatably, so that the cutting efficiency is improved and different demands on the workpiece are met. A filter screen is arranged in a working fluid groove of the fixed shell and at the bottom of a wire electrode, and a third hydraulic cylinder and a lifting plate are arranged at the bottom of the filter screen, so that electric corrosion waste residues generated in a working fluid as a result of cutting are cleaned timely.