Disclosed is an external fixing device used for treatment of a calcaneal fracture, comprising an external fixing plate (1) and a plurality of screws (2), wherein the shape of the external fixing plate (1) is suitable for being fitted to the contour of the calcaneus, a through hollow portion (11) is formed in the thickness-direction of the external fixing plate (1) on the external fixing plate (1) and a plurality of threaded holes (12) are formed on the external fixing plate (1), one end (21) of the screws (2) matches the screw thread of the corresponding threaded hole (12), and the other end of each screw (2) is suitable for being screwed into the calcaneus. The external fixing device is of a relatively light weight and is convenient to operate, has good fixing effects, and causes little damage.