The Chinese-made Sinovac shots were offered under the Covax program, which aims to help poorer nations obtain vaccines.
North Korea is part of the scheme but is yet to receive any doses under it.
The secretive nation imposed strict anti-virus measures from the beginning of the pandemic. It was one of the first countries to close its borders in January last year.
However, health officials have told the BBC that China is increasingly concerned about the potential spread of the virus inside North Korea.
This isn't the first time the country has rejected vaccines. In July, it rejected shipments of around two million doses of the AstraZeneca jab, citing concerns over potential side effects.
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