Floor drain

A floor drain, wherein the floor drain comprising a water outlet, a small-sized water tank, a water return bowl, a water storage tank, a grate and a water drainage hole;

• wherein the water outlet is defined in a center of the water storage tank, an upper end of a wall of the water outlet protrudes from a bottom surface of the water storage tank, a lower end of the wall of the water outlet protrudes from the water storage tank to serve as a pipe joint;
• the water return bowl is box shaped and is made of silicone;
• a bottom of a skirt of the water return bowl directly contacts the bottom surface of the water storage tank to form a closure surface;
• a top surface of the water return bowl abuts against the grate;
• the skirt of the water return bowl is sheet shaped, and the skirt of the water return bowl being bent inwardly under a pressure generated while draining water;
• and
• a water drainage hole of the grate is defined in an edge of the water storage tank;
• the bottom surface of the water storage tank is raised outwardly of the skirt of the water return bowl to form an inner wall having an upper end level with the upper end of the wall of the water outlet;
• a space of the water storage tank for storing water is reduced to be the small-sized water tank;
• the bottom of the skirt of the water return bowl directly contacts the bottom surface of the small-sized water tank to form the closure surface;
• and
• an outer edge of the bottom of the skirt of the water return bowl contacts the inner wall forming a value-like closure surface.