Atleti had gone into the game two points ahead of Real Madrid at the top of the table and were in danger of losing the title before Correa's intervention.
It was hard on Valladolid, with defeat sending Ronaldo's club down into the Segunda Division.
Oscar Plano had given Valladolid hope with an early opener.
Angel Correa acted swiftly to draw the teams level and offer Atletico breathing space at the top of the table.
Luis Suarez completed the fight-back with a well taken finish to deliver Atletico a 2-1 lead.
At the final whistle Atletico's players knew they were champions.
The players were quick to grab coach Diego Simeone.
It was a special moment for Suarez after his rejection by Barcelona last summer.
Officially, Atletico Madrid finished clear by two points at the top of the LaLiga table as 2020/21 champions.
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