The utility model belongs to the field of bathroom technology discloses a closestool, including the pot surface groove and
siphon passage. The pot surface groove includes the washing and brushing bin and the
pollution collection bin, the import of
pollution collection bin is connected with the bottom of washing and brushing bin, the inner wall of
pollution collection bin is concave to the inner wall of washing and brushing bin and forms the expansion area, the import of
siphon passage is connected with the bottom of pollution collection bin, the highest point of pollution collection bin is higher than the highest point of
siphon passage. In the utility model, the lower part of the pot surface groove is larger than the capacity of the existing structure by setting the expansion area, thereby reducing the rising height of the water surface in the pot surface groove during the flushing process, reducing the area of the
dirt in water diffusing with the water surface, by setting the pollution collection bin, and setting the highest point of pollution collection bin higher than the highest point of siphon passage, the
dirt is more concentrated when siphoning, ensuring that the water surface does not rise beyond the pollution collection bin, the water seal surface is located in the pollution collection bin, thereby making the
dirt more easily discharged by the siphon passage, reducing the dirt residue.