The invention provides a method for preparing a bamboo-based 
activated carbon and a preparation device thereof. The method comprises the following steps: A, 
drying, namely crushing bamboo materials at 250-350 DEG G and 
drying the crushed bamboo materials by 
drying air; B 
charring, namely 
charring the dry bamboo materials under the 
oxygen deficit condition by using 550-700 DEG C 
pyrolysis gas as thermal supports; C activating, namely spraying water steam to the charred bamboo materials, activating the bamboo carbon under the 
oxygen deficit condition at the activating temperature of 900-1000 DEG C, and cooling the activated bamboo carbon to obtain the bamboo-based 
activated carbon. The reaction is uniform and complete, the water steam in the activating process is completely contacted with the charred material, the generated 
activated carbon does not easily head and scale in the furnace, and the stability of product quality and the rate of carbon are improved. Moreover, the 
charring dry-
distillation residual heat is completely utilized, the 
energy consumption is reduced, the charring dry-
distillation by-products are recovered, the fume emission is reduced, the 
pollution to environment is reduced, and the comprehensive 
utilization rate of the bamboo materials is improved.