How do i get to danxia shan from guangzhou? Can i visit the place in 1day?

From local Tianhe Bus Station, you can find direct buses to reach Shaoguan East Bus Station. Upon reaching Shaoguan East Bus Station, you can find direct buses to reach that mountain.
It is not suggested to make an one-day visit to that mountain. If you really want to, it is suggested to join a local tour, so that you may have enough time for the attraction.