The invention discloses a tool for assembling a spindle head and a center pull rod of a gas
turbine, wherein the spindle head is provided with a bearing guard, and a
clutch and a step-type joint part provided with a threaded bland hole arranged on the head and the
tail of the bearing guard respectively, and the head of the center pull rod is provided with a threaded section matched with the threaded
blind hole of the joint part of the spindle head. The tool comprises a plurality of roller wheel supporting frames for up-bearing the center pull rod and a spindle head supporting frame, wherein the spindle head supporting frame comprises a
bed body, a pair of linear guide rails axially arranged on the
bed body, a dragging plate arranged on the
bed body and capable of moving forwards and backwards along the linear guide rails, V-shaped lug supports arranged on the dragging plate in tandem and pushing screws at least arranged on two sides of one of the V-shaped lug supports; and the head
clutch of the spindle head is supported on the V-shaped lug support at the front end of the dragging plate, while the joint part at the
tail of the spindle head is supported on the V-shaped lug support at the rear end of the dragging plate. The invention also discloses a method for assembling the spindle head and the center pull rod of the gas
turbine, which is carried out on the assembling tool.