Telescopic router built-in antenna

The utility model discloses a telescopic router built-in antenna, which comprises a shell, an inner rod is inserted in the shell, two groups of limiting blocks are integrally formed on the surface of a sliding block, extension springs are fixedly mounted on the side parts of the two groups of limiting blocks, and a positioning block is inserted in a positioning groove; through the design of structures such as the shell, the inner rod, the extension spring, the mounting block and the positioning block, the inner rod is dragged to move in the shell, so that the length of the antenna can be adjusted according to use scenes and requirements, the coverage range of antenna signals is enlarged, the signal strength is improved, and through the cooperation of the extension spring, the mounting block and the positioning block, the service life of the antenna is prolonged. The positioning block can be clamped in the positioning groove, so that the inner rod can be fixed after being adjusted, the stability of the inner r