Cylinder inner wall grinding device

The invention relates to the field of grinding machining, in particular to a cylinder inner wall grinding device which is used for grinding the inner surface of a cylinder and comprises a driving mechanism and a grinding mechanism, the driving mechanism comprises a rotating shaft and a chassis, and the chassis is fixed to the end of the rotating shaft; the grinding mechanism comprises a first lantern ring, a second lantern ring, a first connecting rod, a grinding cutter, a first elastic piece and a transmission assembly. The first connecting rods are obliquely arranged, and the two ends of each first connecting rod are spherically hinged to the base plate and the second lantern ring correspondingly; the grinding cutter is connected with the midpoint of the first connecting rod; the first elastic piece promotes the grinding cutter to move outwards or have the trend of moving outwards in the radial direction of the first lantern ring; the grinding cutter pushes the middle point of a first connecting rod to move