Self-heating methanol reforming hydrogen production reactor integrating CO selective methanation

The invention discloses a self-heating methanol reforming hydrogen production reactor integrating CO selective methanation. The reactor comprises an upper cover plate, an upper heat exchange plate, aheat exchange plate separation layer, an evaporation plate, a first methanol catalytic combustion plate, a first methanol water vapor reforming plate, a second methanol catalytic combustion plate, a second methanol water vapor reforming plate, a CO selective methanation reaction plate, a lower heat exchange plate and a lower cover plate from top to bottom. A CO selective methanation reaction is integrated in the reactor, and the CO selective methanation reaction is completed by directly using hydrogen in reformed gas; after the reformed gas which is reformed and prepared by a methanol water vapor reaction is subjected to CO selective methanation treatment, the CO content is reduced; in a CO removal process of the reactor, other reactants are not introduced, and the content of hydrogen in final product gas is 70% o