The meat is too salty. - Das Fleisch ist zu salzig.

The salted meat - Das gesalzene Fleisch

"salted meat" means meat which has been salted to preserve it (e.g. through the winter). If you see the expression "salt meat" (which is rare, though "salt beef" is commoner) it means the same. "Salty meat" is meat which tastes salty.

"salt" in chemistry is any slat made by combination of acid and Base. However in common parlance it refers to "common salt" or "table salt" which is chemically NaCl. Therefore "salted meat" may have other salts for preservation but "salty meat" essentially means meat which tastes salty ( with common salt)."too salty" is the right word in query.