The victory marked Poland’s second over China in this year’s tournament, after a 3-1 win in Beijing, Polish state news agency PAP reported.
Poland will face defending champions Italy on Saturday for a spot in the gold medal match.
Italy remain unbeaten in the competition after sweeping the United States 3-0 earlier on Wednesday.
Poland are aiming to improve on back-to-back bronze medal finishes in the past two Nations League seasons.
Alicja Grabka, a key player for Poland, told reporters the team was setting its sights on reaching the final this year.
Poland coach Stefano Lavarini. Photo: PAP/Marian Zubrzycki
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Source: IAR, PAP