Is Newmaifu owned by China people?

No, Newmaifu is provided by GoodmanFielder, one of the milk companies in New Zealand. GoodmanFielder, founded in 1909, is one of the listed food companies in Australia and an edible oil supplier in Australia and New Zealand. Headquartered in Melbourne and Sydney, the company covers 25 countries and regions such as Australia, New Zealand, Pacific and Asia.