NOVELTY - Preparing bamboo carbon slow-rebounding sponge comprises: (A) preparing materials; (B) stirring and mixing uniformly; (C) respectively feeding the first mixed liquid into the first feeding pipe and the second mixing liquid into the second feeding pipe, keeping the temperature in the foaming mold, controlling feeding ratio under the control of the material feeding gun; (D) foaming the foaming mold; and (E) cooling the foaming insulating material cutting block.    USE - Method of preparing bamboo carbon slow-rebounding sponge.    DETAILED DESCRIPTION - Preparing bamboo carbon slow-rebounding sponge comprises: (A) preparing materials (pts.wt.): preparing first polybasic alcohol (20-85) which is a polymer of ethylene glycol and propylene glycol with hydroxyl value of 45-99 mg KOH/g and second polybasic alcohol (10-90) which is trimethylolpropane and epoxy butane copolymer polyol with hydroxyl value of 3-22 mg K0H/g in a raw material tank, preparing methylene diphenyl diisocyanate (8-30) in the second tank, bamboo carbon powder (1-8), foaming agent (3-6), catalyst (5-1), surface active agent (0.3-0.9), flame retardant (0.2-0.5) and silicon rubber toughening agent (0.2-0.8); (B) stirring and mixing uniformly to obtain a mixed solution where the first stirrer contains the prepared methylene diphenyl diisocyanate, bamboo charcoal powder, foaming agent, catalyst, surfactant, flame retardant agent and stirring and mixing uniformly to obtain the second mixing liquid in the second mixer; (C) respectively feeding the first mixed liquid into the first feeding pipe and the second mixing liquid into the second feeding pipe, keeping the temperature in the foaming mold at 40-50 degrees C, controlling feeding ratio according to the prescription under the control of the material feeding gun to foaming mold; (D) foaming at 40-50 degrees C for 1-8 minutes at 25-40 degrees C for 5 hours; and (E) cooling the foaming insulating material cutting block. An INDEPENDENT CLAIM is included for the preparation method of bamboo charcoal powder comprising:    (A) adding the cutoff wedge from the top part of the vertical moving bed and preliminary drying bamboo;    (B) carbonizing the pyrolysis gas generated from the upper to the lower on the drying section with bamboo counter-current bamboo drying;    (C) condensing the discharged from the top gas of the bamboo vinegar condenser to obtain bamboo vinegar liquid;    (D) controlling the combustion with different positions and with different type lifting temperature;    (E) raising the temperature to 700-750 degrees C for 40-80 minutes and 1000-1500 degrees C for 2-8 hours; and    (F) adjusting the opening or closing of the small hole at one side of the calcining area to obtain carbon powder.