The big hole is the space after you remove 洗碗机

It is much easier to stop the water back flow into the dishwasher through the drain pipe than to remove the dishwasher. All you need to do is to find out how the drain pipe is conneted and try to raise the level of it, so the water will not back flow into the dishwasher.
To remove it,
1. Turn the electrical circuit that supplies power to the dishwasher OFF, or if it is plugged into an outlet, unplug it. Close the water valve that supplies water to the dishwasher.

2. Unscrew the two screws holding the dishwasher to the countertop. These screws are located right in front of the dishwasher. Gently slide the dishwasher out from under the counter.

3. Follow the electrical cord to the junction box, usually on the lower rear side, and remove the cover.

4. Use a voltage tester to ensure the circuit is OFF and disconnect the wiring. Remove the electrical cord from the junction box and place wire nuts on the ends of each wire, then move the wires so they won't be in the way.

5. Under the dishwasher, locate the water inlet line. Remove the nut holding it in place and remove the water line. (Keep a towel handy to soak up any draining water still in the line.)

6. Under the sink, locate the dishwasher's drain line and disconnect it from the sink's drain line or garbage disposer.

7. You need block the hole on the disposer or replace the disposer.
8. install a new cabinet in the hole where dishwasher was or cover it up with a board.

Just stop the water back flow to the dishwasher!!!!!
If you can not do it, just forget about removing the dishwasher, it is 10 + times harder.
Send some pictures if you can.