The invention relates to a pipeline bus and a detachable bus unit thereof and solves a technical problem of inconvenient dismounting of a bus unit in the prior art. The detachable bus unit of the pipeline bus includes a cylinder body, a conductive rod and an insulator, wherein the insulator includes a fixed supporting insulator and a moving supporting insulator, when the conductive rod is fixed onthe fixed supporting insulator, a right end of the conductive rod stretches out of the bus unit, the conductive rod includes a detachable section and a remaining section, a right end of the conductive rod is provided with a conductive connection structure used for being in conductive connection with an adjacent bus unit in a detachable mode, length of the detachable section is greater than lengthof the right end of the conductive rod stretching out of the bus unit when the conductive rod is fixed on the fixed supporting insulator, a detachable portion of the cylinder body is provided with amaintenance hole for a tool to extend into the cylinder body to dismount the detachable section, the detachable section can be removed from the maintenance hole, alternatively, the cylinder body has the radial space for the detachable section and the remaining section which are arranged side by side along the radial direction of the cylinder body.