NOVELTY - A biomass gasification automatically controlled boiler comprises base, hoarding, clinker chamber where front leads to clinker cleaning door, front ventilation plate which is above front edge of ash removing furnace bar is provided at front bottom of clinker chamber, secondary combustion chamber which is adjacent to furnace is at back top of ash removing furnace bar, fire blocking plate with sandwich structure at middle part is for separating, flue which is between lower end of fire blocking plate and ash removing furnace bar, and sandwiched water jackets.    USE - Biomass gasification automatically controlled boiler.    ADVANTAGE - Can work at high efficiency and low discharge to meet the requirement of environment protecting and energy saving.    DETAILED DESCRIPTION - A biomass gasification automatically controlled boiler comprises base, hoarding, clinker chamber where front leads to clinker cleaning door, furnace which is above ash removing furnace bar, front ventilation plate which is above front edge of ash removing furnace bar is provided at front bottom of clinker chamber, secondary combustion chamber which is adjacent to furnace is at back top of ash removing furnace bar, fire blocking plate with sandwich structure at middle part is for separating, flue which is between lower end of fire blocking plate and ash removing furnace bar, water supplying port and back water port, sandwiched water jackets on top and around furnace, feed inlet in front top of furnace is equipped with feed covering plate, and primary air passage which is connected with furnace through air inlet. The front ventilation plate is connected with clinker cleaning door in front of clinker chamber. The fire blocking plate and secondary combustion chamber, and bottom sides of connected sandwiched water jackets are connected into one body with hoarding. The sandwiched water jacket has upper settling chamber which is opened forwardly has fire pipes passing through sandwich water jackets to connect with secondary combustion chamber, ash cleaning cover plate, settling and flue conversion chamber has fire pipes passing through sandwiched water jacket to connect with back part of upper settling chamber, and lower settling chamber has fire pipes passing through sandwiched water jacket to connect with bottom of settling and flue conversion chamber. The back opening of settling and flue conversion chamber is port of flue conversion device. The back opening of lower settling chamber is port of draught fan. The lower opening leads to ash cleaning chamber with ash cleaning door that has ash cleaning door cover. The back wall of secondary combustion chamber has spoiler with secondary air passage which is connected with plural secondary air though holes, and also connected to secondary air entrance at lateral face of furnace.