in the Chinese sense and context,反垄断 is officially translated as anti-monopoly.

See examples below:

Competition law - Wikipedia
Competition law is a law that promotes or seeks to maintain market competition by regulating anti-competitive conduct by companies. ... Competition law is known as antitrust law in the United States for historical reasons, and as "anti-monopoly law" in China and Russia.
‎History of competition law · ‎Competition law theory · ‎Japanese competition law
https://en.wikipedia.org/en.wikipedia.org › wiki › Anti_Monopoly_Law_of_China
Anti Monopoly Law of China - Wikipedia
Anti Monopoly Law of China refers to the Anti-Monopoly Law of the People's Republic of China, passed by the National People's Congress on 30 August 2007, ...

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Note added at 2 hrs (2020-01-14 10:15:22 GMT)
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Anti-monopoly is the official translation found in documents in China Ministry of Commerce:

english.mofcom.gov.cn › article › policyrelease › Businessregulations
Anti-monopoly Law of the People's Republic of China -
Aug 3, 2008 - Article 10 The authorities responsible for enforcement of the Anti-monopoly Law specified by the State Council （hereinafter referred to, ...