Floor drain is an important interface connecting the drainage pipeline system and the indoor ground, and its performance directly affects the discharge of surface water and the quality of indoor air. At present, the structural design of floor drain is more to emphasize the anti-odor function, and will adopt all kinds of floor drain cores, which are generally directly close to the position below the base, and this structural design is only considered from the anti-odor performance, and the water flow velocity problem is not considered. In drainage, the drain core part will always have a certain limiting effect on the flow rate of the water body due to its own structural design, and the sewage that flows into the base from the surface directly enters the water seal structure at a lower speed, so that from the drain core to the sewer pipeline, the sewage basically relies on the natural overflow effect to carry out low-speed drainage, and there is a defect that the drainage flow rate is slow. In addition, the floor drain core of the existing floor drain is generally integrally formed or fixed on the base, and the floor drain core that is easy to hide dirt and dirt is not easy to take out and clean.