The invention discloses a T-shaped arc extinguishing chamber component butt-joint tool. The tool comprises a base; the base is provided with a positioning portion for positioning an operation box and two track trolleys which are symmetrically arranged at the left side and right side of the positioning portion; the two track trolleys are assembled on the base in a leftward and rightward guide movable manner; supporting rollers which support arc extinguishing chambers from below are respectively assembled on the two track trolleys in a rotatable manner; and the rotation axes of the supporting rollers extend leftwards and leftwards. When T-shaped arc extinguishing chamber components are to be in butt-joint with the operation box, the operation box is installed on the positioning portion of the base in a positioned manner; the two arc extinguishing chambers are arranged on the two track trolleys and are supported by the supporting rollers on the track trolleys, and therefore, the two track trolleys can be pushed to move oppositely on the base, and therefore, the arc extinguishing chambers can be in butt-joint with the left side and right side of the operation box, and in the butt-joint process, the supporting rollers support the arc extinguishing chambers in a rolling manner, so that the arc extinguishing chambers can rotate freely around the axes of the arc extinguishing chambers, and thus, the arc extinguishing chambers can be in butt-joint with the transmission rod of the operation box.