The disease, which has caused havoc in South Korea and South Arabia, has no proven cure so far.
Fudan University, which worked with US National Institutes of Health to develop the antibody, today said the tests on animals had seen "very effective" results.
Jiang Shibo, who led the research team at Fudan, said the m336 antibody could neutralise MERS virus more effectively than other antibodies.
Zhong Nanshan, a renowned respiratory expert, called for an immediate clinical trial.
China is currently treating one person with MERS who contracted it in South Korea.