Cylinder barrel inner hole machining device of hydraulic cylinder

The invention belongs to the technical field of hydraulic cylinder production, and particularly relates to a hydraulic cylinder barrel inner hole machining device which comprises a first hydraulic cylinder, a grouting pipe, a storage box, a conveying pump and a plugging structure. A first hydraulic cylinder drives a connecting base to descend and drives a grouting pipe to be inserted into a cylinder barrel, so that the top of the cylinder barrel is sealed and blocked through a recycling structure, meanwhile, the bottom of the cylinder barrel is sealed and blocked through a blocking structure, and then a conveying pump pumps out abrasive paste stored in a storage box and conveys the abrasive paste into the grouting pipe in a pressurized mode; the grinding paste is conveyed to the bottom of the cylinder barrel along the grouting pipe and discharged into the bottom of the cylinder barrel from the grout outlet, the gap between the grouting pipe and the cylinder barrel is filled with the grinding paste, and the gr