The invention discloses an electric device assembly cabinet having functions of accurate temperature control and independent dehumidification. The electric device assembly cabinet having functions ofaccurate temperature control and independent dehumidification comprises a cabinet body, electric device assemblies arranged inside the cabinet body and an air conditioner. The air conditioner is installed on a back door of the cabinet body. An upper fan and a lower fan are installed on the upper part and the lower part of the cabinet door, on which the air conditioner is installed, wherein wind blowing directions of the upper fan and the lower fan can be adjusted. The upper fan and the lower fan send cool air to positions of main heating components and air flows inside the cabinet can performcirculation without dead corners through revolving of the fans. A semiconductor dehumidifier is installed on the bottom of the cabinet body. The semiconductor dehumidifier is used for cooling part ofair inside the cabinet body in order to maintain the air inside the cabinet body at relatively low humidity so as to avoid fluctuation of relative humidity which causes local water condensation when air conditioner refrigeration starts. The semiconductor humidifier having the independent humidification function is installed on the bottom of the cabinet body can intelligently detect relative humidity inside the cabinet, can control the relative humidity under 70%, and can maintain the internal of the cabinet always under low humidity, so that, when the air conditioner refrigeration starts, thewater condensation risk which is caused by accelerating rise of relative humidity due to temperature drop can be avoided.