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This invention discloses a lifeline system for omnidirectional movement without removing the safety harness hook. The system includes a hook assembly, an entrance / exit node assembly, a connecting node assembly, a turning node assembly, a T-junction node assembly, a cross-junction node assembly, and a wire rope assembly. Each node assembly is arranged according to the lifeline's direction, and adjacent node assemblies are connected via the wire rope assembly. The entrance / exit node assembly is used for the hook assembly to enter and exit; the connecting node assembly is used for connecting the wire rope assemblies; and the turning, T-junction, and cross-junction node assemblies are used for omnidirectional movement of the hook assembly. This system overcomes the shortcomings of traditional high-altitude work safety protection, solving the problem of omnidirectional movement without removing the safety harness hook. It allows construction workers to work normally and move omnidirectionally even under the restriction that they cannot remove the safety harness hook themselves, effectively eliminating the risk of falls from heights caused by worker inertia or a sense of complacency.