[Object] To provide a method of producing a homopolymer or random copolymer of hydroxyl group-containing vinyl ether simply and conveniently as well as efficiently. [Means for solving problem] A method of producing a homopolymer or random copolymer of hydroxyl group-containing vinyl ether according to the present invention comprises the step of polymerizing a monomer component comprising at least one hydroxyl group-containing vinyl ether using an oil-soluble radical polymerization initiator in the absence or presence of a solvent.