To provide a stable and efficient method for producing an oxyethylene chain-containing vinyl ether polymer where decomposition of monomers and formation of polyacetal can be suppressed. This method for producing an oxyethylene chain-containing vinyl ether polymer includes a step of polymerizing a vinyl ether represented by formula (1) (where R1 is an alkyl group having 1 to 3 carbon atoms and n isan integer of 1 to 10) at pH 5 or more, in the presence of water as a polymerization solvent, a basic compound as an additive, and an organic azo-based compound as a radical polymerization initiator.