The invention discloses a bamboo pulp sponge product and a preparation method thereof. Bamboo pulp is used as a main raw material. The method comprises the following steps of: 1) soaking, namely adding sodium hydroxide solution into the bamboo pulp raw material at the temperature of between 25 and 35 DEG C, and reacting the mixture to generate AC alkali cellulose and water; 2) squeezing, namely squeezing the AC alkali cellulose through a squeezer, filtering the redundant sodium hydroxide solution to form cakes, and crushing the cakes into granules or blocks of 5 to 10 millimeters; 3) yellowing, namely reacting the granular or block alkali cellulose and carbon disulfide at the temperature of between 25 and 40 DEG C under vacuum to obtain xanthate; 4) gluing, namely adding bamboo pulp or wood pulp into the xanthate, and soaking the mixture into water to form a glue; and 5) molding, namely adding an inorganic acid salt pore-forming agent of alkali metal or alkaline earth metal into the glue, standing the mixture for 5 to 7 hours after mixing, then putting the mixture into a mold for molding, condensing by using current and foaming to prepare the sponge product consisting of 92 to 94 weight percent of methylcellulose, 4.5 to 5.5 weight percent of S10 cellulose and 0.5 to 3.5 weight percent of reinforced cellulose. The sponge product has the characteristics of strong water absorption, soft texture, strong dire and oil removing capability, long-time storage and accommodation, unchanged quality, pure natural and unpolluted product and the like.