The utility model discloses a mine flameproof dry type transformer and a flameproof casing and a bellows body thereof. The flameproof casing comprises a casing base and a bellows box body; reinforcement ribs are uniformly distributed on the internal pipe wall of the bellows box body around the peripheral direction, and extend along the axial direction of the bellows box body; two ends of the bellows box body are respectively provided with an end flange; and a trough of the internal pipe wall of the bellows box body is internally provided with a supporting ring. The utility model has simple structure, and is convenient in processing; as the trough is internally provided with the supporting ring and the internal pipe wall of the bellows box body is provided with the reinforcement ribs, so that the entire stiffness of the bellows box body is uniformly distributed on the transverse and longitudinal directions, and the damage and deformation of the mine flameproof casing can be effectively avoided, further, the service life of the flameproof casing is prolonged and the use cost of the mine flameproof casing is saved.