The invention relates to a vinyl chloride resin production system, and particularly relates to an automatic kettle coating system and method for a micro-suspended-emulsion type vinyl chloride resin production process. The system is characterized in that a kettle coating liquid storing tank, a nitrogen storing tank, a pure water storing tank and a polymerizing kettle top spraying assembly are connected to a pipeline mixer, wherein the polymerizing kettle is connected to a DCS system. Kettle coating liquid is conveyed into the pipeline mixer and is fully atomized through nitrogen, then the kettle coating liquid enters a spraying assembly on the top of the polymerizing reaction kettle along an input pipeline and finally coats the inner wall of the polymerizing kettle; after the kettle is coated, clamp sleeve process is carried out for increasing the temperature so as to dry the kettle coating liquid; flushing water is conveyed to the polymerizing kettle top spray head assembly through a pure water pump utilizing the pipeline mixer so as to flush redundant kettle coating liquid on the wall of the kettle, and then liquid residual in the coated kettle is completely drained. With the adoption of the system and the method, the working intensity and the production consumption can be reduced while the kettle coating effect is effectively improved.