The utility model discloses a power transforming box with antitheft, alarm and temperature regulating functions. The power transforming box comprises a shell body. The internal part of the shell body is provided with a pressure reducing device. The two sides of the top end of the internal part of the shell body are respectively provided with a temperature inductor and a humidity inductor. The lower ends of the temperature inductor and the humidity inductor are provided with small fans. An electronic screen is inlaid in the upper end of the shell body. The shell body is provided with a door plate. An observation window is inlaid in the door plate. The lower end of the observation window is provided with an antitheft lock which is connected with an alarm device. The lower end of the antitheft lock is provided with a handle. A pedestal is fixedly connected at the lower end of the shell body. The shell body is provided with ventilation ports which are internally provided with a protection screen. Supports are fixedly connected at the upper end of the shell body. A sunshade cover is fixedly connected at the upper ends of the supports. According to the power transforming box with the antitheft, alarm and temperature regulating functions, temperature in the box can be automatically regulated, and perpendicular incidence of sunlight can also be reduced. The antitheft lock is adopted so that equipment safety can be protected. The pressure reducing device is particularly adopted so that equipment safety can be effectively protected.