How to separate that calligraphy wood pap stuck on the wood block?

Absolutely. This is the uncovering in calligraphy mounting. The method is to spray water on the board with calligraphy written on it, then gently make a small corner on the calligraphy paper with a small shovel after it is completely wet, then slowly and carefully tear off all the calligraphy paper, and then immediately stick the torn paper on the wall. In a couple of days, when the paper is dry, it will be OK. Be especially careful when operating. This is a special calligraphy mounting technology. If you can't do it, it's more reliable to get it to the calligraphy mounting master.