NOVELTY - A vertical combined gasification furnace comprises furnace body with heat insulating layer, spiral feeding mechanism, spiral slag-discharge mechanism and transmission mechanism. A dry distillation gasification area, pyrolysis gasification area and secondary cracking gasification area are provided in furnace body. A main shaft connected with coupling is provided in dry distillation gasification area. A tine harrow, stirring rod, spiral slice and gear grinder rotor are fixed to main shaft.    USE - A vertical combined gasification furnace for solid biomass.    ADVANTAGE - Technical processes including dry distillation gasification and pyrolysis gasification are integrated in the furnace. The structure of furnace is compact. The carbon transformation ratio is improved to more than 95%. The thermal value of obtained single combustible gas product reaches 8000 kJ/Nm2 to fully use solid biomass.    DETAILED DESCRIPTION - A vertical combined gasification furnace comprises furnace body with heat insulating layer, spiral feeding mechanism, spiral slag-discharge mechanism and transmission mechanism. A dry distillation gasification area, pyrolysis gasification area and secondary cracking gasification area are provided in furnace body. A main shaft connected with coupling is provided in dry distillation gasification area. A tine harrow, stirring rod, spiral slice and gear grinder rotor are fixed to main shaft. The rotor is meshed with stator fixed to end part of dry distillation gasification area to composite gear grinder. A guide flow sleeve for dividing pyrolysis gasification area and secondary cracking gasification area is provided on stator. The pyrolysis gasification area is provided below the gear grinder. A wind distributing plate, main spray pipe and auxiliary spray pipe are provided below pyrolysis gasification area. One end of main spray pipe is connected with wind distributing plate, and the other end is connected with jet exhauster. The jet exhauster is connected with dry distillation outlet in parallel. A water seal clinker chamber is connected with furnace body on lower end of pyrolysis gasification area. The clinker chamber is connected with spiral slag-discharge mechanism. One end of fuel gas delivery pipe provided in dry distillation gasification area is connected with secondary cracking gasification area, and the other end is connected with fuel gas outlet. Observation and inspection holes and igniting hole are provided on furnace body.