Provided is a low-noise temperature monitoring device of electrical equipment.A wireless transmitting and receiving device is erected in a box, the back face of the box is provided with a through cavity used for exhausting air, the surface of the edge of the box is provided with a through cavity used for supplying air, the through cavity used for exhausting the air and the through cavity used for supplying the air are oppositely arranged in the diagonal direction, the through cavity used for supplying the air is provided with a mesh screen, and a fan used for supplying the air is erected on the face on the lower portion of the through cavity used for supplying the air; in addition, the through cavity used for exhausting the air is particularly located of the upper portion of the back surface of the box, and the defects that in the prior art, due to space constraint of a displayer, the cooling range is small, the efficiency is low, running correctness of the displayer cannot be guaranteed, the wireless transmitting and receiving device cannot achieve the efficient cooling effect, and the noise is large are overcome.