I'm starting and a newbie to use libgdx and try to load a 3d model.
I just want to ask if libgdx have function or library that can load my 3d model or should I create a .obj loader for me to load it.
You could be more specific about what file format you want to load, and what research you've done, if any. That said, I think this what you're looking for: https://github.com/libgdx/libgdx/blob/master/gdx/src/com/badlogic/gdx/graphics/g3d/loader/ObjLoader.java
For a bit of an example, see this SO question: libgdx obj loader problen