Hi and welcome Alessandro
Ive only travelled to Yunnan which is the heart of the coffee growing region in China. I saw one dedicated coffee-equipment shop in Dali (old town) so I imagine there would be others in other cities. The shop sold a range of devices, most seemed to be of Chinese manufacture and unknown quality. But the guest house where I stayed in Dali used a made-in-China machine and was quite drinkable but they were using freshly roasted Yunnan coffee. I couldnt tell you the brand of the machine.
You might want to send a PM to Coffee Snob Epic 76 who lives in HK. He may provide some "local knowledge" advice.