Double-layer filtering water seal floor drain

The utility model provides a double-layer filtering water seal floor drain which comprises a cylinder body, a floor drain floor is arranged at the bottom end of the cylinder body, a drainage pipe is coaxially arranged on the floor drain floor, a sealing cover located between the drainage pipe and the inner wall of the cylinder body is arranged in the cylinder body, and the height of the sealing cover is larger than that of the drainage pipe in the cylinder body. A plurality of drainage holes are formed in the side wall of the sealing cover; and a first grate and a second grate which are positioned above the sealing cover are arranged on the cylinder body. The first grate and the second grate play a role in double-layer filtration, so that the problem that a single-layer filter screen plate is easy to block in the background art is solved. By arranging a sealing cover, a drainage hole and a drainage pipe, a water seal ring is formed by self-generation under the condition that drainage can be guaranteed, and od