As you know, there are many stream platforms in China like QQ, Kugou, Kuwo, NetEase, Xiami. Kpop companies have agreements with different platforms. At the following list, all sources and streaming platforms have been considered.
Here is 2019's the most streamed Kpop artists in mainland China (excluding Taiwan, Hong Kong etc.):
#1 EXO (7,298,655,131)
#2 BIGBANG (5,049,927,881)
#3 T-ARA (3,944,676,066)
#4 LAY (EXO) (1,919,331,623)
#5 SNSD (1,826,991,000)
#6 G-DRAGON (BIGBANG) (1,601,778,459)
#7 F(X) (1,296,000,442)
#8 TAEYEON ( SNSD) (977,123,088)
#9 SUPER JUNIOR (567,029,664)
#10 IU (553,122,767)
Source: Kpop Charts - Lord_Exidius
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Wow some groups on this list are even inactive, good to see their music still lives on