The invention provides a totally split type carbon ring sealing device. The totally split type carbon ring sealing device comprises two units capable of being combined to form a complete sealing device through a connecting structure, wherein a sealing ring, a sealing cavity, a tension spring, a wave plate spring and a rotation-proof structure are arranged in each unit, the sealing ring is arranged in a groove in the sealing cavity, two split surfaces of the sealing ring and two split surfaces of the sealing cavity are located in the same plane, the tension spring is arranged between the outer ring surface of the sealing ring and the bottom of the groove in the sealing cavity, two ends of the tension spring are planes and are attached to the surface of a pit of the sealing cavity, a wave plate spring groove is formed in the groove side surface opposite to the non-sealing surface of the sealing ring, the sealing surface of the sealing ring is attached to the corresponding surface of the groove, and the rotation-proof structure for preventing the sealing ring from rotating is arranged between the sealing ring and the sealing cavity. According to the totally split type carbon ring sealing device, assembling on the scene can be performed conveniently and simply, containerize degree, assembling precision and safety of split type carbon ring sealing are greatly improved, and cost is obviously reduced.