With 73 votes in favour, 50 against and no abstentions, lawmakers on Friday put an end to the political uncertainty in the country, in which opposition lawmakers called for the removal of several ministers.
"I thank the Congress of Peru for granting the vote of confidence," Castillo tweeted, urging legislators to seek consensus to "govern together with the people and for the development of public policies of a social nature".
Castillo took office in July after defeating a right-wing rival in a hard-fought presidential runoff.
He announced a series of reforms, including drafting a new Constitution.
Over the past five years, Peru has been roiled by political crises resulting from recurring clashes between the Congress and the executive branch.
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