Is it illegal to see feng shui consultation?

No, the state doesn't recognize Feng Shui as a science. All we have to do is sell dog meat by hanging sheep's head and operating under a different name. Now everyone does this. As long as you pay taxes, industry and commerce will not interfere with you. In fact, people in China believe in geomantic omen, and people need the services of geomantic omen. I wish you success!