The invention discloses an air-floating plane rolling tool. The air-floating plane rolling tool comprises a tool shank part and a tool body, wherein the tool shank part comprises a tool shank and a tool shank connecting block; the tool body comprises a tool connecting cylinder and a ball component; a bearing board, a force sensor, a sensor fixing seat and a support seat are sequentially arranged in the tool connecting cylinder from top to bottom; a ring-shaped groove is formed in the top of the tool shank; a clearance cavity capable of forming an air film is formed in the support seat and located above balls; eight through holes are formed in the tool shank, the tool shank connecting block, the bearing board and the sensor fixing seat from top to bottom in a penetrating manner; air pipes penetrate the through holes to be communicated with the ring-shaped groove and the clearance cavity respectively. According to the air-floating plane rolling tool, cold air is introduced into the clearance cavity above the balls by the air pipes, so that cooling of the alls in a working state can be accelerated, meanwhile, abrasion of the balls is decelerated, lubrication is enhanced, the surface of a workpiece is prevented from being excessively burnt and can be modified during extrusion, and accordingly, the rolling machining efficiency is further improved.