Zhou Qiang, the head of the Supreme People's Court, has at times been seen as a reformer keen on limiting the influence of government officials on the courts.
However, Chinese state media quoted him over the weekend as instructing leading judges to "draw your sword" against words and actions running counter to the ruling Communist Party's dictates.
Since seizing power in 1949, the party has maintained strict control over the government, judiciary and China's highly influential military despite the rapid social change accompanying breakneck economic growth.
Responding to Zhou's comments, Chinese legal scholars including Peking University professor He Weifang said the public would lose confidence in a legal system seen to be in thrall to the party.
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"If there is no judicial independence, the ultimate result can only be injustice everywhere, sparking unrest. Calling judicial independence a Western concept and taking joy in its elimination is the sort of talk and action that leads to disaster for the nation and its people," he wrote.
Despite his reform reputation, it was not the first time Zhou has criticised what he deemed to be ideas unsuitable for China's political system.
In 2015, he told a party committee that the high court will "resolutely resist the influence of mistaken Western concepts and ways of thinking."
China rejects the notion of an American-style separation of powers and its constitution emphasizes the unassailable primacy of the Communist Party.
In his remarks, first reported Saturday by the state-controlled China News Service, Zhou also urged China's judges to avoid the "trap" of judicial independence, follow the road of socialism with Chinese characteristics and "protect government leaders, the image of heroes, and the glorious history of the party and the People's Army" according to the law.
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