The utility model relates to an all-welded enamel PVB (polyvinyl Butyral) reacting kettle. The reacting kettle comprises a kettle, a transmission device, a rack, stirrers, outer clamping covers, an outer condenser, temperature monitoring mechanisms, a quick-opening manhole and a symmetrical baffle plate, wherein a closed kettle is adopted and lined with enamel; the outer condenser is mounted at the top end of the kettle; the temperature monitoring mechanisms are mounted at the top end and on the side surface of the kettle; the quick-opening manhole is formed in the top end of the kettle; the transmission mechanism at the top end of the kettle is fixed through the rack and connected with the stirrers in the kettle; the outer clamping covers are mounted in the middle of the kettle and outside the bottom end of the kettle; the symmetrical baffle plate is mounted in the middle of the kettle. According to the utility model, the reacting kettle has the following benefits: in the PVB producing process, the mixing is uniform in the reacting process, the quality of products can be effectively improved, the reacting heat can be stably and effectively withdrawn, the problems of materials adhering to a wall and agglomeration can be effectively overcome, the distributing effect of raw materials is good, and the reacting selectivity is high.