The invention relates to a method for manufacturing a composite bamboo floor block by adopting excess materials, and belongs to the technical field of decoration engineering of buildings. The method is characterized by comprising the following steps: firstly, putting bamboo floor excess materials of different types into a die, and paving a board; secondly, pressing the board for 20 to 25 minutes by a cold press, and tabling and prepressing the board; thirdly, thermally pressing the board for 30 to 40 minutes at the temperature of between 130 and 140 DEG C under the pressure of 10 to 30MPa; fourthly, cooling the board to 50 to 120 DEG C, then maintaining the pressure for 30 to 35 minutes under the pressure of 5 to 25MPa, and naturally cooling the board to normal temperature to obtain the composite bamboo floor block; and finally, polishing and edging the composite bamboo floor block. Therefore, trivial bamboo floor excess materials which are used as wastes in the prior home decoration process are fully utilized. Meanwhile, the new manufactured bamboo floor block has high adaptability for different habitable rooms during paving, is skid-proof and abrasion-resistant, and has mosaic beautiful effect that the prior bamboo floor blocks cannot reach.