You need an embassy visa for Mainland China if you have a Mexican passport
Visa options for Mainland China
Visitor visa
Travellers need a visa to visit China for Business or Tourism. A paper or embassy visa is the only visa available for travellers visiting China. The visa is typically a stamp or sticker added to the passport. Travellers must obtain this visa from a local embassy, consulate or visa center before travelling. Travellers with valid visas issued before March 28th, 2020, may use them to enter China.