The invention relates to an automatic drilling device for cylinder barrels of hydraulic cylinders, and belongs to the field of machinery manufacturing. The automatic drilling device comprises a progressive feeding unit, drilling units, deburring and hole
quality monitoring units and cylinder
barrel locating and clamping units, wherein the progressive feeding unit, the drilling units, the deburring and hole
quality monitoring units and the cylinder
barrel locating and clamping units are respectively and fixedly arranged on a bottom plate C of a reference plate of the whole
machine and are supported by a main body framework; the cylinder barrels are transmitted from the progressive feeding unit to the cylinder
barrel locating and clamping units, and meanwhile, machined cylinder barrels can be taken down; the cylinder barrel locating and clamping units and the deburring and hole
quality monitoring units work at the same time. The automatic drilling device disclosed by the invention has the advantages of
modular design, novel structure, abundant functions and high
automation degree; combined cleaning in holes and the cylinder barrels is adopted, and burrs can be completely removed through a mutual match burr removing scheme; after a
drill bit is abraded, cutter length compensation can be carried out through parameter setting in a touch screen, i.e., the hole depth is controlled through a
servo motor, and the size accuracy is ensured; a
reliability design is fully considered by the whole
machine, the
modular design is carried out, thus enough strength is obtained, and convenience is provided for maintenance and management in the future.