According to the Realmeter survey, support for Moon added 0.7 percentage points over the week to 47.9 percent this week.
The negative assessment on Moon's conduct of state affairs fell 0.2 percentage points to 48.9 percent.
It came as the daily caseload of the coronavirus here steadied for the past days. The daily infections hovered below 100 from Sunday to Wednesday, before recording 152 on Thursday.
Moon ordered "unprecedented measures" to be taken to tackle the economic fallout from the COVID-19 outbreak.
The government announced 11.7 trillion won (9.1 billion U.S. dollars) worth of supplementary budget bill that was passed through the parliament on Tuesday.
The central bank slashed its target rate from 1.25 percent to an all-time low of 0.75 percent on Monday in its first emergency move since the 2008 global financial crisis.
During the first "emergency economic council" meeting earlier in the day, Moon unveiled a 50-trillion-won (39-billion-U.S. dollar) emergency financial aid package for small businesses and heralded additional measures to support people who lost jobs or income over the virus outbreak.
Support for Moon's ruling Democratic Party lost 0.6 percentage points over the week to 40.9 percent this week.
The main conservative opposition United Future Party gained 35.1 percent of approval score, followed by the centrist People's Party with 3.9 percent and the minor progressive Justice Party with 3.2 percent.
The results were based on a poll of 1,501 voters conducted from Monday to Wednesday. It had plus and minus 2.5 percentage points in margin of error with a 95-percent confidence level.
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