Pipeline drainage device

The pipeline drainage device comprises a shell, a pipe cover, a water collecting box, a connecting assembly and a guide rod, a cavity is formed in the shell, a water inlet and a water outlet which communicate with the cavity are formed in the shell, the water inlet is located in the top of the shell, and the water outlet is close to the bottom of the shell; the pipe cover covers the water inlet, and a water permeable hole communicated with the cavity is formed in the pipe cover; the water collecting box is located in the cavity and provided with a water collecting cavity with an opening in the top and a leakage hole communicated with the water collecting cavity, and the leakage hole is formed close to the bottom of the water collecting box; the guide rod extends in the vertical direction, the pipe cover is arranged at the top end of the guide rod, and the guide rod is connected with the water collecting box through a connecting assembly. The water collecting box moves downwards and drives the guide rod and th