The invention discloses a light composite splicing tube segment and a spliced tunnel danger avoiding device, and relates to the field of safety devices. The tube segment is transversely partitioned into a tube segment male port region, a tube segment main body region and a tube segment female port region in sequence, wherein the tube segment main body region comprises an outer structural layer, an anti-impact layer and an inner structural layer; the anti-impact layer is arranged between the outer structural layer and the inner structural layer; the tube segments in the tube segment male port region and the tube segment female port region have solid fiber structures. The device comprises a plurality of tube segments, and two adjacent tube segments are connected in a socket and spigot joint way. The tube segments are thin in pipeline wall thicknesses, and can be carried and spliced manually; the tube segments are spliced easily, conveniently and firmly in the socket and spigot joint way, and can adapt to a complex and severe construction environment; the pipe segment has the advantages of high impact resistance, high compression strength and high reusability.