The invention provides a coaxial type self-closed joint. The coaxial type self-closed joint is characterized by comprising a straight-through male connector and a straight-through female connector which are connected in an inserted mode. The male connector and the female connector are connected with a pipeline. The male connector is provided with a convex connection pipe. The female connector is provided with a casing pipe corresponding to the connection pipe. The inner diameter of the casing pipe is slightly larger than the outer diameter of the connection pipe, and therefore the casing pipe and the connection pipe can be connected in a sleeved mode. A telescopic valve element is arranged inside the male connector. A fluid channel is arranged between the valve element and a male connector shell in the axial direction. The inner wall of the male connector shell is provided with a step away from to the joint direction. The diameter of the valve element is larger than the inner diameter of the step of the shell. The outer edge end of the valve element and the step are sealed through an elastic material. The casing pipe and the connection pipe are sealed through an elastic material. A locking device is further arranged outside the male connector and the female connector. According to the coaxial type self-closed joint, soft-hard dual seal is adopted, the sealing effect is good, and the working conditions of high temperature and high pressure can be met.