The invention relates to a garment capable of alarming rapidly and preventing body heat from dissipating outwards. The garment comprises a garment body (1), wherein a button (2) is arranged at each cuff of the garment body (1), a GPS (3) is arranged at a pocket, a communication module (4) is arranged at the front body, and the buttons, the GPS and the communication module are connected through leads respectively; a lining layer is compounded to the back of the garment body, and is composed of a lining layer body, a thermal insulation layer, a cavity layer and a surface layer which are tightly compounded together in the sequence from inside to outside, and the surface layer is formed by interweaving yarns containing conductive fibers and yarns containing common fibers. When a crime occurs, the two buttons are pressed, the communication module automatically reports the information of the GPS to the 110 alarm number, after receiving the alarm, a policeman can arrive at the scene at the first time for preventing the crime, and thus a victim can be protected; in addition, the garment can prevent the body heat from dissipating outwards.