The invention relates to an internal self-cooling device of enclosed equipment. The device comprises an equipment box body. A right side of an external portion of the equipment box body is connected to a control system. An inner wall of the equipment box body is provided with a plurality of air inlets in the box body. A bottom of the equipment box body is provided with the air inlets. The air inlets are connected to a blower fan. A joint of the air inlets and the blower fan is provided with a valve, and the blower fan is connected to a cooling chamber through a pipe fitting. A top of the cooling chamber is provided with an air outlet. A right side of the air outlet is provided with the air inlet. A right side surface of the equipment box body is provided with an independent cooling blower fan. An upper side of the independent cooling blower fan is connected to a temperature sensor. The blower fan and the cooling blower fan are separated and used so that reliability of a cooling system is greatly increased; an influence of a service life of the cooling blower fan on a whole set of equipment can be completely avoided; a cooling effect is good; a cooling speed is fast; and the service life is prolonged. An internal portion of the equipment box body forms an integrated structure, extra power consumption is not needed, cost is saved and an integrated economic benefit is increased.