The invention discloses a polar plate of a micro-disc type focused logging device. The polar plate comprises the polar plate and polar plate electrodes arranged on the plate surface of the polar plate, wherein the polar plate is in the shape of a rectangle, the two ends of the polar plate are in circular arc-shaped structures, and the polar plate electrodes comprise a main electrode A0 at the center of the plate surface of the polar plate, as well as an annular electrode M0 and an annular electrode A1 which are sequentially distributed on the periphery of the main electrode A0 from inside to outside; and two groups of semi-circular electrodes, namely a monitor electrode M1 and a monitor electrode M1', as well as monitor electrode M2 and a monitor electrode M2', are symmetrically distributed on the two sides of the annular electrode A1, the electrode distances from the monitor electrode M1, the monitor electrode M2', the monitor electrode M2 and the monitor electrode M1' to the main electrode A0 are equal, and after signals acquired by the two groups of the monitor electrodes are synthesized by a transformer, the two groups of the monitor electrodes controls the main current measurement. Since the electrodes of the novel polar plate are the two groups of the semi-circular type electrode structures and the overall dimension and the shape of the polar plate are further changed, the novel polar plate has the advantages of stable electric field, a large measurement dynamic range, high measurement precision, good layering capability and the like.