The invention discloses a reaction kettle for producing liquid barium-zinc heat stabilizer, which comprises a shell, an agitator, and a heater, the agitator comprises an agitating shaft and blades, the blades are fixed on the agitating shaft, the agitating shaft extends into the shell, a feed inlet and a discharge outlet are arranged on the shell, the heater is embedded in the blades, the heater comprises heating resistance wires and wires, the heating resistance wires are coiled in the blades, the wires are connected to a power supply, the agitating shaft is provided with vertical slide ways, the blades are fastened in the vertical slide ways by means of sliding shafts, pneumatic cylinders are mounted on the agitating shaft, and the other ends of the pneumatic cylinders are connected to the sliding shafts of the blades. When the reaction kettle for producing liquid barium-zinc heat stabilizer disclosed by the invention is utilized to prepare liquid barium-zinc heat stabilizer, the agitator can move up and down, consequently, substances can be promoted to be uniformly heated, reaction is thorough, the heat preservation time is shortened, and the production efficiency is increased.