Latching device for automatic take-up spool

The utility model relates to a latching device for an automatic take-up spool. The latching device comprises an inner rotary table (1), an inverted L-shaped bent plug (3), a plug (6), a tension spring (7) and a triangular clamping column (10), and aims to provides the latching device that even being pulled out of the inverted L-shaped bent plug (3), the plug (6) can clamp the inner rotary table (1); when stay wire is performed at the first time, the plug (6) is inclined under the pressure of the inverted L-shaped bent plug (3), and the tail part of the plug is clamped on the triangular clamping column (10) to be inclined; during wire laying, the inner rotary table (1) rotates reversely, the tip part of the plug (6) is supported on a clamping head (5) of the inverted L-shaped bent plug (3) to generate the rocker playing effect, the tail part of the plug (6) downwards falls to separate from the triangular clamping column (10) so as to clamp the inner rotary table (1), when the stay wire is performed at the seco