The invention provides an electrical cabinet with a high-efficiency heat dissipation function for the high-temperature environment, relates to the field of the electrical cabinet, and solves the problems of no automatic and high-efficiency heat dissipation and poor heat dissipation effect. The electrical cabinet is technically characterized by comprising a rectangular box and a blowing heat dissipation mechanism and a natural heat dissipation mechanism which are arranged in the rectangular box. The natural heat dissipation mechanism comprises a rectangular box, a pair of semi-circular connecting pipes and volatile liquid. The rectangular box is arranged on the inner rear surface of the rectangular box. Two pairs of circular openings are arranged on the two ends of the upper surface of therectangular box. A pair of semi-circular connecting pipes are arranged inside the two pairs of circular openings. The volatile liquid is arranged inside the rectangular box. A plurality of semi-circular grooves are arranged on the front and rear surfaces of the rectangular box. The blowing heat dissipation mechanism comprises a blowing part and an air suction part. The blowing part is used for blowing and dissipating heat for the inside of the rectangular box. The air suction part is used for sucking out the hot air flow inside the rectangular box.