How can I clear products template cache after update sale ? Because product price don't change ... Thank you.
More than likely the issue is not the prices not updating, but the sale conditions as Luke mentioned.
In theory, Craft will automatically clear template caches when an element within the cached region is updated (note one trap is this process of deleting stale template caches runs as a job task, so may not happen absolutely immediately...give things 30 seconds or so before you check them).
If things don't seem to be working for whatever reason, you can clear caches manually using the Craft control panel.
Thus, in case it is somehow cache related:
Craft 2: Control panel -> settings -> clear caches
There are now console commands to clear caches (run
./craft on its own and it will list all of the available commands e.g.
Or, you can of course still use the control panel-> utilities -> clear caches