Polyoxymethylene dimethyl ether synthesis device

The invention discloses a polyoxymethylene dimethyl ether synthesis device. The synthesis device comprises a dissolving tank A and a dissolving tank B, wherein the upper end of the dissolving tank A is provided with a methylal feed port and a first alpha-polyformaldehyde feed port, and the bottom is provided with a discharge port; one side of the dissolving tank A is provided with a first polymerization reactor and a second polymerization reactor of which the tops communicate with each other; the bottom of the first polymerization reactor communicates with the bottom of the dissolving tank A through a first communicating pipe and is provided with a first high-pressure pump; the dissolving tank B is arranged at one side of the second polymerization reactor; the bottom of the second polymerization reactor communicates with the top of the dissolving tank B; the top of the dissolving tank B is further provided with a second alpha-polyformaldehyde feed port; one side of the dissolving tank B is provided with a thi