Production apparatus of methacrylic acid

The invention provides a production apparatus of methacrylic acid. The production apparatus can simplify equipment. The production apparatus comprises a first reactor (10); second reactors (R1 to Rn)n represent an integer greater than 2; pipelines (LA) for connecting the outlet of the first reactor (10) with the inlets of the second reactors (R1 to Rn) and providing the material flow branches from the outlet of the first reactor (10) to the inlets of the second reactors (R1 to Rn); and pipelines (LB), which are connected to the outlets of the second reactors (R1 to Rn) and merge the materialflows from the outlets of the second reactors (R1 to Rn). The heights (A) of the bottoms of the second reactors (R1 to Rn), the heights (H) of the second reactors (R1 to Rn), the pipelines in the runners from the branches of the pipelines (LA) to the second reactors (R1 to Rn), and the pipelines in the runners from the outlets of the second reactors (R1 to Rn) to the converging part of the pipelines (LB) all meet required