Side phase conductor support device for transmission line tower and method for mounting the device

The invention discloses a side phase conductor support device for a transmission line tower, the device comprises the transmission line tower, a cross arm is fixedly arranged on the transmission line tower, a plurality of suspension insulator chains are arranged on the end of the cross arm, the device also comprises a rigid insulation supporting device, one end of the rigid insulation supporting device is connected with the inner side of the end portion of the cross arm, the other end of the rigid insulation supporting device is connected with the bottom of the suspension insulator chains. The beneficial effect of the device comprises: 1, the effect of avoiding windage yaw accident is obvious, especially for circuits which cannot be effected by general windage yaw proofing arrangement and cannot be transformed as V-shaped chains; 2, the device has simple structure and is safe and reliable, only a hanging hole added on the end portion of the cross arm is needed in the mounting process, and a large reconstructi