Reunion visa and Chinese work visa are two different types of visas that generally cannot be held simultaneously.
The reunion visa is issued on the basis of kinship, so that foreigners can live together with their relatives in China.
The work permit allows foreigners to work legally in China.
However, in some special circumstances, such as when foreigners are working in China, their family members come to China with a reunion visa. This is the existence of the two visas on different people at the same time, but not on the same person.
However, if you are the same foreigner, you can only hold one valid type of Chinese visa at the same time to clarify your main purpose and identity in China.