The invention discloses a degradable 3D (three-dimensional) PHBV (poly hydroxyl butyrate valerate) base printing consumable and a preparation method thereof, and belongs to the field of 3D printing. The consumable comprises, by weight, 60-90 parts of PHBV plastics, 5-9 parts of PLC (poly lactic acid) plastics, 40-60 parts of starch, 4-6 parts of toughening agents, 6-8 parts of lubrication degradation agents, 0.15-0.85 part of anti-tackiness agent, 10-12 parts of coupling agents and 3-8 parts of plasticizers. The preparation method includes the steps: weighing formulation components, drying and the like. The PHBV consumable can effectively improve toughness and stability of the PHBV consumable, softness and elasticity of the PHBV consumable are improved, the preparation method of the PHBV consumable can effectively improve dryness of the PHBV consumable, and the accuracy of a 3D printing finished product cannot be affected by influence of humidity on the PHBV consumable.