The invention relates to machining devices, in particular to a high-accuracy pressure container machining device which comprises a shaft, a pressure container, a first end plate, a corrugated pipe, multiple nozzles, a through hole, a second end plate and a high-pressure air pipe. The shaft is fixedly connected with the first end plate, the second end plate and the high-pressure air pipe sequentially, the through hole which is axial is drilled in the center of the right end of the shaft, the nozzles are mounted on the shaft between the first end plate and the second end plate and communicated with the through hole in the shaft, two ends of the corrugated pipe are fixedly connected with the first end plate and the second end plate respectively, and the first end plate, the second end plate and the corrugated pipe form a closed space. The high-accuracy pressure container machining device has the advantages that the high-accuracy pressure container machining device is high in machining speed, high in machining quality, free of deformation in barrel, convenient to operate and suitable for mass machining, labor intensity is lowered, and accuracy can be guaranteed.