anyone know how to defeat the lava dragon statue genshin?

which one do you mean, the big statue in Natlan that spits fire? if so you're not meant to kill it like a boss. it's a puzzle, you hit the glowing spots with the element it asks for (usually hydro or cryo on anything fire themed) and the thing shuts down for a bit. if it's actually a field boss then just stay off the ground when it winds up, the lava pools do more damage than the hits themselves. post the area and i can be more specific