Method for synthesizing polyolefin and application thereof

The invention provides a method for synthesizing polyolefin, which comprises the following steps of: providing a polymerization reaction system comprising a first reactor and a second reactor which are communicated with each other, and introducing a circulating material containing an olefin monomer, a molecular weight regulator and at least two inert condensing media into the polymerization reaction system; regulating and controlling the proportion of at least two inert condensing media in the circulating material and the temperature of the circulating material, so that the circulating material is partially condensed; a part of the partially condensed liquid material enters a first reactor, and the liquid material is in contact with a catalyst in the first reactor to generate first polyolefin; the partially condensed gas material, the residual liquid material and the first polyolefin enter a second reactor, and the gas material, the liquid material and a catalyst are in contact in the second reactor to genera