The invention relates to the electrical device, more particularly to a switch terminal box with the characteristic of hot-line replacement. The switch terminal box is composed of a box body and a plugging board. The box body consists of an upper box body and a lower box body that are communicated mutually; a top cover is arranged at the top of the upper box body; an upper opening is formed in oneside of the upper box body; an upper box door in rotation connection with the upper box body is arranged at the upper opening; a lower opening arranged at the same side as the upper opening is formedin the lower box body; and a lower box door in rotation connection with the lower box body is arranged at the lower opening. A dehumidification and temperature adjusting control device is arranged inthe box body. An upper connecting plate extends from the bottom of the upper box body outwardly; a lower connecting plate is arranged at the top of the lower box body by corresponding to the upper connecting plate; and the upper connecting plate and the lower connecting plate are connected by bolts. A plurality of plugging ports cooperating with the plugging board are formed in the inner walls atthe two sides of the lower opening of the lower box body. The terminal box can be replaced with the hot-line operation; the replacement efficiency and the safety are high; and the moisture proof effect is good.