Only 17 per cent of respondents to the Angus Reid survey said they approve of Selinger's performance.
That is down from 30 per cent from a similar poll in September.
Selinger has been fending off a revolt by some caucus members, including five former cabinet ministers who resigned their portfolios last month.
Angus Reid surveyed 800 Manitobans between December 4 and 13 as part of an online panel.
The polling industry's professional body, the Marketing Research and Intelligence Association, says online surveys cannot be assigned a margin of error as they are not a random sample, and therefore are not necessarily representative of the whole population.
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