Thai food is not necessarily halal, because Thailand is a multi religious country, including Buddhism, Islam, Christianity and other religions. Therefore, the way Thai food is made and the choice of ingredients will also be affected by different religious beliefs.
For Muslims, they follow the provisions of halal food, and can only eat food that has passed halal certification. Therefore, if you want to make halal Thai food, you need to follow the production regulations of halal food and use halal certified ingredients and spices.
However, most Thai food is not halal, because Thailand's main religion is Buddhism, and Buddhism does not make strict regulations on food production and consumption. Therefore, Thai food usually uses various ingredients and seasonings, including non halal food such as pork, shrimp, crab, and usually does not follow the production regulations of halal food.
In a word, Thai food is not necessarily halal, which depends on the specific production method and food material selection. If you want to make halal Thai food, you need to follow the production regulations of halal food and use halal certified ingredients and spices.