An inner tube having a disconnected pattern, which comprises an inner tube body having an elongated shape, two ends of which respectively comprise a first closed surface (111, 211) and a second closed surface (121, 221), one end of which extends to define a sleeve (112, 122, 212) along a length direction of the inner tube body, and the first closed surface (111, 211) and the second closed surface (121, 221) are connected face-to-face by the sleeve (112, 122, 212) to enable the inner tube body having the elongated shape to be spliced to define the inner tube linked end-to-end; after the inner tube body is inflated, the first closed surface (111, 211) and the second closed surface (121, 221) are radially expanded and are encompassed and positioned by the sleeve (112, 122, 212); wherein the two ends of the inner tube body having the elongated shape are respectively disposed with a first joint and a second joint, and free ends of the first joint and the second joint respectively comprise the first closed surface (111, 211) and the second closed surface (121, 221); the inner tube being characterized in that the second closed surface (121, 221) is a groove (1211, 2211), and the free end of the second joint extends to define the sleeve along the length direction of the inner tube body; wherein the first closed surface (111, 211) is a step plug comprising a first plug and a second plug (1112, 2212) connected along the length direction of the inner tube body, and when the first plug is inserted into the groove (1211, 2211), the second plug (1112, 2212) is disposed in the sleeve (112, 122, 212) to enable the inner tube body having the elongated shape to be spliced to define the inner tube linked end-to-end; wherein a groove wall of the groove (1211, 2211) and a sleeve wall of the sleeve (112, 122, 212) are connected by a limiting surface (124, 213); wherein the first plug and the second plug (1112, 2212) of the step plug are connected by a first limiting matching surface (1115, 1116, 2214, 2213), and the second plug (1112, 2212) and a side wall of the first joint are connected by a second limiting matching surface (1115, 1116, 2214, 2213); when the first plug and the groove (1211, 2211) define a plug-in relationship: the limiting surface (124, 213) abuts the first limiting matching surface (1115, 1116, 2214, 2213) to be positioned along a plug-in direction, and the second limiting matching surface (1115, 1116, 2214, 2213) abuts an end surface of the sleeve wall of the sleeve (112, 122, 212) to be positioned along the plug-in direction; and wherein the groove (1211, 2211) is an arc-shaped groove, and the groove (1211, 2211), the limiting surface (124, 213), and the sleeve wall of the sleeve (112, 122, 212) are connected by circular arc-shaped corners; wherein the first plug is correspondingly an arc-shaped plug, and the first plug, the first limiting matching surface (1115, 1116, 2214, 2213), the second plug (1112, 2212), the second limiting matching surface (1115, 1116, 2214, 2213), and the side wall of the first joint are connected by circular arc-shaped corners. after the inner tube body is inflated, the first closed surface (111, 211) and the second closed surface (121, 221) are radially expanded and are encompassed and positioned by the sleeve (112, 122, 212); wherein the two ends of the inner tube body having the elongated shape are respectively disposed with a first joint and a second joint, and free ends of the first joint and the second joint respectively comprise the first closed surface (111, 211) and the second closed surface (121, 221); the inner tube being characterized in that the second closed surface (121, 221) is a groove (1211, 2211), and the free end of the second joint extends to define the sleeve along the length direction of the inner tube body; wherein the first closed surface (111, 211) is a step plug comprising a first plug and a second plug (1112, 2212) connected along the length direction of the inner tube body, and when the first plug is inserted into the groove (1211, 2211), the second plug (1112, 2212) is disposed in the sleeve (112, 122, 212) to enable the inner tube body having the elongated shape to be spliced to define the inner tube linked end-to-end; wherein a groove wall of the groove (1211, 2211) and a sleeve wall of the sleeve (112, 122, 212) are connected by a limiting surface (124, 213); wherein the first plug and the second plug (1112, 2212) of the step plug are connected by a first limiting matching surface (1115, 1116, 2214, 2213), and the second plug (1112, 2212) and a side wall of the first joint are connected by a second limiting matching surface (1115, 1116, 2214, 2213); when the first plug and the groove (1211, 2211) define a plug-in relationship: the limiting surface (124, 213) abuts the first limiting matching surface (1115, 1116, 2214, 2213) to be positioned along a plug-in direction, and the second limiting matching surface (1115, 1116, 2214, 2213) abuts an end surface of the sleeve wall of the sleeve (112, 122, 212) to be positioned along the plug-in direction; and wherein the groove (1211, 2211) is an arc-shaped groove, and the groove (1211, 2211), the limiting surface (124, 213), and the sleeve wall of the sleeve (112, 122, 212) are connected by circular arc-shaped corners; wherein the first plug is correspondingly an arc-shaped plug, and the first plug, the first limiting matching surface (1115, 1116, 2214, 2213), the second plug (1112, 2212), the second limiting matching surface (1115, 1116, 2214, 2213), and the side wall of the first joint are connected by circular arc-shaped corners.