The move gives the socialist leader an edge for a few weeks in his maneuvers against the center-right opposition which has vowed to devise within months a way to oust him.
"A state of economic emergency is declared across the whole territory of the nation... For 60 days," read the decree published by the official state gazette.
Maduro's new economy minister, Luis Salas, was expected to give further details later today.
That will be his first face to face encounter with his rivals in the National Assembly since the opposition took control of it last week.
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The opposition's new legislative powers have deepened a political struggle in the recession-stricken South American nation of 30 million people.
The center-right opposition vowed to launch legislative measures to oust Maduro this year and has vowed to fix the economic crisis.
Maduro branded the opposition a US-backed "bourgeoisie" and vowed to defend his socialist policies.
He had already promised to launch an emergency plan for the economy, which was expected to propose new forms of production to reduce Venezuela's reliance on oil exports.
The institutional arm-wrestle threatened to paralyze the National Assembly legislature this week, until last-minute compromises set the stage for Maduro to deliver his annual presidential report.
"We will receive him calmly and respectfully," said the new speaker of the assembly, Henry Ramos Allup, a leading opponent of Maduro.
Leaders have been wary of fanning tensions during the past two weeks of political maneuvering, mindful of deadly street clashes in 2014.
Maduro secured a Supreme Court injunction limiting the opposition's legislative powers to cut short his mandate.
It bowed to pressure from the court, which Maduro's rivals say is controlled by his allies.
Three opposition lawmakers agreed to quit while the court investigates them over government allegations of electoral fraud.