The invention discloses an insulated mounting or detaching rod of a transformer vibration signal online monitoring sensor. The insulated mounting or detaching rod comprises a mounting or detaching rod, a handle, telescoping adjusting elastic rope fasteners, an insulated rope and a clamping structure. The handle is mounted on one end of the mounting or detaching rod, and one end of the insulated rope can wind the handle. The insulated rope is mounted in the mounting or detaching rod and is connected with the clamping structure. The clamping structure can be locked through tightening the insulated rope by pulling. The clamping structure is mounted on the other end of the mounting or detaching rod and can be opened or closed for clamping a sensor. The mounting or detaching rod is a multi-segment telescopic rod, and telescoping of each segment is controlled by the telescoping adjusting elastic rope fasteners. The insulated mounting or detaching rod has beneficial effects of adjustable length, simple structure and easy use. Not only can requirement for mounting/detaching height be satisfied, but also an insulation problem is considered. Effective safety insurance is realized. Furthermore the insulated mounting or detaching rod facilitates an experiment in actually measuring the transformer vibration signal.