Which one is correct? 这家餐馆菜都很好吃的
这家餐馆的菜都很好吃


What's the correct form to say "all the food of that restaurant it's delicious" ?
Number 2 is correct. 
Number 1 translates as This restaurant food is delicious. (Does not make sense)
Number 2 translates as The food in this restaurant is delicious. (Should be what you are looking for)