The invention relates to a preparation method of hydroxyl-terminated polyacrylate oligomers, which comprises the following steps: preparing low molecular weight polyacrylate oligomers with controllable molecular weight, such as polybutylacrylate, polyethylacrylate, oly(isooctyl acrylate), polymethyl methacrylate, a block copolymer of butyl acrylate and methyl methacrylate, a block copolymer of the methyl methacrylate and dimethylaminoethyl methacrylate, and the like by adopting atom transfer radical polymerization (ATRP) and using organic halide as an initiating agent; and then carrying out terminal group modification on the polymers by N-methylethanolamine to obtain the hydroxyl-terminated polyacrylate oligomers with controllable molecular weight. The prepared hydroxyl-terminated polyacrylate oligomers can be used for the production of polyurethane. Because the molecular weight of the hydroxyl-terminated polyacrylate oligomers is controllable, a polyurethane material with special performance can be prepared.