The invention relates to the technical field of a garment, in particular to a self-heating suit. The self-heating suit comprise a suit body, wherein a suit inner layer is sewed on the inner side of the suit body; the upper end of the suit body is sewed with a connecting collar; collar openings are sewed on the upper ends of the two sides of the suit body; sleeves are sewed at the upper parts of the two sides of the suit body; pockets are formed at the lower parts of the two sides of the suit body; a plurality of buttons are sewed in positions, located under the collar openings, of the suit body; decoration buttons are sewed in positions, located at one side of the buttons, of the suit body; a connecting opening is formed in a position, located at one side of the buttons, of the suit body;two buckle seats are sewed at one side, far away from the suit body, in each sleeve; a sleeve coat is put at one side, far away from the suit body, inside each sleeve; a bulge is sewed in position, located at one side of a clamp buckle, of each sleeve coat, and is clamped in the corresponding buckle seat; a smooth layer is sewed at one side, far away from the corresponding bulge, of each sleeve coat. The self-heating suit have the advantage of simple structure, and is worthy of being popularized.