The invention relates to a novel plane bearing, which comprises a ball, a ball support, an upper gear sheet and a lower gear sheet, wherein the inner sides of the upper gear sheet and the lower gear sheet are provided with an annular guide groove corresponding to the ball respectively; the outer sides of the upper gear sheet and the lower gear sheet are provided with an annular oil groove respectively; and the annular oil grooves can be matched with a mounting plane of the plane bearing to form a closed annular oil passage. Lubricating oil in the annular oil passage is dispersed to the whole mounting plane in the shifting process of a crane shaft of a compressor, an oil film is formed between the mounting plane and the upper gear sheet or the lower gear sheet, and the oil film plays a role in buffering the shifting so as to effectively prolong the service life of the plane bearing.