The sink drains normally, but there is water overflowing from the drain mouth on the kitchen floor,

There are several possibilities:

1. The main drainage pipe is blocked, and the water upstairs overflows; need to unclog drains;

2. The drainage pipe of your own house is blocked and needs to be dredged;

3. If the drainage pipe is damaged or the water pipe at home is too small, you need to find a professional to replace it.

Extended information: How to unclog kitchen drains.

1. Look through it yourself first, but pay attention to PVC or cast iron. Buy a 2-meter pipe dredge on the stall, make some bends at the head 2 cm, put water on the water, extend the dredge into the water outlet, stretch it in while shaking, and then extend it into the dredge at the water inlet while releasing the water, repeat it several times! At the same time, it should be dredged every other week in the future.

2. Find a wire with a diameter of millimeters, 3-4 meters long, fold it in half from the middle, and then twist it into a strand, and then bend the two heads in different directions on the side of the single end, and then stretch this end into the sewer pipe, grab the other end, and twist it in one direction while going inside. Then the problem may not be your home, it may be the pipe blocked downstairs.

If it's not clogged, replace the longer hose and stuff it into the sewer pipe. Real-life personal experience.

The middle of the pipe may have been blocked, and the last time our house was looking for a long time, someone poured rice into it.

Is the problem solved? I'm having a similar issue.