Can you tell the leader to take care of the dragon's health?

The expression "taking care of the dragon body" is not appropriate.

First of all, the word "take care" is usually used in Chinese to wish others good health, but the word "dragon body" does not exist. In ancient China, the dragon was a symbol of imperial power, and only the emperor could call it the "dragon body", so the usage of this word was very formal and limited to a specific historical background.

Therefore, if you want to express your hope that the leader is healthy, you can say "take care of yourself" or "take care of yourself", which is more appropriate.