Solution polymerization reactor

The utility model relates to a solution polymerization reactor which comprises a horizontal reaction kettle, the first end of the horizontal reaction kettle is a feeding end, the second end of the horizontal reaction kettle is a discharging end, and a gas distribution plate which is arranged close to the feeding end and is used for uniformly spraying feeding gas into a reaction cavity is arranged in the reaction cavity. A spiral coil which is arranged along the axial direction and is used for controlling the temperature of a reaction system is arranged in the reaction cavity. The reaction kettle disclosed by the utility model is of a horizontal structure, so that the phenomenon of backmixing of reaction materials due to the action of self gravity can be avoided, the first-in first-out of the materials is ensured, and the retention time of the materials in the reaction kettle is consistent; the gas raw material is quickly and uniformly dissolved and dispersed in the solvent of the reaction system through the g