The invention discloses a vertical type modular coal water slurry corner tube boiler. The vertical type modular coal water slurry corner tube boiler comprises a boiler body, a hearth, a combustor, a combustion stabilizing chamber, a dry bottom hopper, an air preheater, a coal economizer, a convection tube beam, an upper collecting tank, a top collecting tank, a boiler barrel and a lower collecting tank. The boiler body comprises 4 down pipes arranged at four corners and a membrane water wall. Two ends of each down pipe and two ends of the membrane water wall are respectively communicated with the upper collecting tank and the lower collecting tank. The convection tube beam is arranged on outer side of the membrane water wall, the top is communicated with a smoke outlet of the hearth, and the bottom is communicated with the bottom of the air preheater. The dry bottom hopper is arranged at the bottom of the boiler body. The boiler body is divided into the boiler barrel, the dry bottom hopper, the convection tube beam and the membrane water wall to be manufactured and installed. The vertical type modular coal water slurry corner tube boiler has the advantages of being compact in integral structure, simple in appearance arrangement, small in occupied area, low in steel consumption, large in boiler water circulating differential pressure, safe and reliable in water circulation, quick and simple in manufacture and installation, reliable in boiler operation, simple and convenient to maintain and the like.