"In the Harry Potter story, the dark wizard Voldemort dies because the seven horcruxes, which contain parts of his soul, have been destroyed," ambassador Liu Xiaoming wrote yesterday in an op-ed in the Daily Telegraph newspaper.
"If militarism is like the haunting Voldemort of Japan, the Yasukuni Shrine in Tokyo is a kind of horcrux, representing the darkest parts of that nation's soul," he added.
He became the first Japanese head of government since 2006 to pay respects at Yasukuni, which honours Japan's war dead including 14 indicted Class A war criminals.
Japanese cabinet minister Yoshitaka Shindo followed up with a visit of his own yesterday.
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Abe said last week that the goal of his shrine visit was "to pledge and determine that never again will people suffer in war", but the site is seen elsewhere as a reminder of Japan's 20th-century aggression against China and other Asian nations.
Beijing has been on a diplomatic offensive over the issue, with Foreign Minister Wang Yi making calls to his counterparts in the US, South Korea, Vietnam, Germany and Russia "to convey his alarm", the state-run China Daily newspaper reported.
Liu's op-ed appears to fit into that effort, and he reminded Britons that the victims of Japan's wartime horrors included their own countrymen, noting a new film that "tells the tragic story of a British PoW tortured by the Japanese in the Second World War".
"Our two countries have a common responsibility to work with the international community to oppose and condemn any words or actions aimed at invalidating the peaceful post-war consensus and challenging international order," he added.