im mexican, i can process my visa from china in thailand directly?

Hi, Danie, since you do not reside or work in Thailand, the embssy would not accept your application. You had better apply a Chinese L visa in your home country before leaving for Thailand. a single entry China visa has a validity of 3 months. If your Thainland Visit is just around the corner, and you have limited time in your own country, you can ask for express or rush service. By this way, you can get the visa in one or two working days. Good luck!