Can I apply for a work permit directly with a tourist visa in Thailand?

Work visa or work permit? If you want to apply for a work visa, you must have a contract and a work permit. But you still have to leave the country and enter the country. You don't need to go back to China. You can go to Cambodia for a day and then go back to Thailand. If you have a work permit, you can do it in a government department with a contract and some company certificates. It will be ready in half an hour. Work permits should be handled by companies, because they know the procedures best.