The invention belongs to the technical field of power safety equipment, and particularly relates to an electric power intranet network safety monitoring device. The device comprises a monitoring host,the monitoring host is placed in a box body. A transverse supporting plate is fixedly arranged in the box body; the monitoring host is placed on a supporting plate, a plurality of through holes penetrating through the supporting plate are formed in the supporting plate, a fan is installed at the bottom of the box body, a plurality of through ventilation openings are formed in the side walls of the two sides of the box body, and dust screens are arranged on the outer sides of the ventilation openings and fixedly arranged on the outer side wall of the box body. The two sides of the monitoring host are movably connected with clamping plates. One side, away from the monitoring host, of each clamping plate is connected with a clamping spring, the defects in the prior art are overcome, the monitoring host is protected, impact or collision is prevented from affecting the host, an adjustable connecting wire clamping mechanism is arranged, the effect of stabilizing a connecting wire is achieved, and meanwhile maintenance is convenient.