The invention discloses a halogen-free flame retardant ABS material and a preparing method thereof and belongs to the field of plastic. The material is prepared from the following components including, by weight, 100 parts of ABS type resin, 0-20 parts of toughening agents, 5-25 parts of red phosphorus, 0-25 parts of phenolic resin, 0-10 parts of zinc borate and 0.4 part of an antioxidant. Compared with the prior art, the technology is reasonable, and the beneficial effects that the impact strength is high, the fluidity is high, the smoke amount is low, and processing and industrialization achieving are easy are achieved; and a halogen-free fire retardant is adopted and is environment-friendly, harmful gas cannot be generated during a fire, so that the life safety of people is not affected, and a wide application prospect is achieved.