The invention relates to the field of chemical equipment and in particular relates to a material supply unit for a liquid reaction kettle. The material supply unit comprises supply devices and a power unit, wherein the supply devices can be uniformly arranged along the periphery of the reaction kettle body and can input reaction liquid into the reaction kettle under the action of the power unit; the power unit is mounted below a bracket of the reaction kettle and is capable of regulating the volume and speed of the input reaction liquid; and the quantity of the supply units can be determined according to types of reaction materials. The material supply unit disclosed by the invention is mainly applicable to supply operations of multiple liquid mixing reactions in the field of chemical industry, a supply unit with adjustable material supply types and speed can be provided for the reaction kettle in the chemical production process, the chemical reaction is conveniently regulated, and the reaction efficiency can be improved.