What language did the Chinese in the paleolithic era speak?

Actually, there is no exact language back to the time, and people used simple body language and onomatopoeia to communicate.

Bro depends on what era in the Paleolithic.
If we are looking genetically Ydna NO and Ydna P (R and Q ancestor) were present in China.
At first sign language and clicks would be spoken in the beginning.
Later you’d most likely encounter Proto-East Asian. Considering that Tianyuan Man of Bejing left descendants among Yeniseian, Native Americans and Proto-Indo-European speakers; Yamna Culture; and not Modern Chinese populations. Perhaps Tianyuan Man spoke a proto-proto language of one of those 3 major languages.