The invention discloses a power transformer fixing device. The power transformer fixing device comprises a mounting plate; a damping box is fixedly connected to the top of the mounting plate; telescopic rods are fixedly connected to the two sides of the bottom of the inner wall of the damping box; a supporting plate is fixedly connected to the tops of the telescopic rods; a first spring is arranged on the surface of each telescopic rod in a sleeved mode; and the bottom of the first spring is fixedly connected with the bottom of the inner wall of the damping box. By virtue of matched use of thedamping box, a fixed plate, a fixed piece, a transformer body, a supporting rod, the supporting plate, the first springs, the telescopic rods, a first fixed base, a connecting rod, a sliding rod, a sliding sleeve, second springs, fixed blocks and a second fixed base, the problem that an existing power transformer fixing device does not have a shock absorption function is solved; and the power transformer fixing device has the advantage of damping, so that the abrasion of the transformer is reduced, the service life of the transformer is prolonged, use of a user is facilitated, and the practicability of the power transformer fixing device is improved.