The suspect, who has been arrested, castrated a mentally disabled man aged 60 and removed one testicle each from two bedridden patients aged 53 and 80, the official Xinhua news agency said.
The man "tied up the three inpatients and removed their private parts with a dull razor", Xinhua cited doctors and victims in northeast China's Heilongjiang province as saying.
Xinhua cited a member of staff as saying that the suspect, in his 30s, was mentally ill and housed at the home, but patients claimed he was an employee.
Authorities in the area could not be reached for comment about the attack, which happened on Tuesday.
Conditions in many Chinese homes for the elderly and disabled are poor, with many establishments troubled by insufficient beds, funding and poor management.
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