PURPOSE: To provide a fully automatic centrifugal fluid barrel working device which exhibits excellent work efficiency without deteriorating a work environment.

CONSTITUTION: In a sealed gear chamber S inside a disc part, a sun gear 91, a planet gear 92, and a rotation gear 93 are built in, and the sun gear 91 rotates the rotation gear 93 via the planet gear 92, while the rotation gear 93 rotates a rotation shaft As a joint ring 94 fixed on a carriage supports an end wall 42 on the barrel non-clamping side in the disc part freely rotationally with relativity while being fitted in a revolution shaft 2 freely rotationally with relativity, so that invasion of rubbish into the inside can be prevented, and a compact device constitution can be provided. In addition, dip-feed lubrication is accomplished.