The invention relates to a production method of 3-hydroxypropionate, which mainly solves the problems of complex catalyst preparation and low activity in the prior art. The present invention is by adopting the method for producing 3-hydroxypropionate, under the presence of cobalt salt, ligand and cocatalyst, ethylene oxide, synthesis gas and alcohol, reaction obtains 3-hydroxypropionate; Wherein, described cobalt salt It is one of cobalt phosphate, cobalt sulfate, cobalt acetate, cobalt chloride, cobalt carbonate, cobalt nitrate, cobalt hydroxide, cobalt oxide, cobalt oxalate, the ligand is an N-containing ligand, and the cocatalyst is a metal The technical solution of powder or carrier loading metal element better solves this technical problem and can be used in the industrial production of 3-hydroxypropionate.