The invention belongs to the field of high-polymer materials, and particularly relates to a high-flame-retardancy nylon composite material for 3D printing. The high-flame-retardancy nylon composite material is prepared from the following raw materials in parts by weight: 100 parts of nylon resin, 3-8 parts of filler, 5-15 parts of toughener, 0.5-1 part of antioxidant, 0.3-0.8 part of compatilizer, 0.5-1.5 parts of lubricant and 5-10 parts of DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) derivative flame retardant. According to the high-flame-retardancy nylon composite material for 3D printing in the invention, the DOPO derivative flame retardant is added in the nylon composite material system, so that the flame retardant structure contains the fluorine element having low surface energy, thereby having high surface mobility and being capable of forming a high-flame-retardancy film on the surface of a base material; the structure contains the silicon element, thereby having the advantages of favorable flame-retardant effect, no smoke, high temperature resistance and favorable chemical stability, and simultaneously improving the mechanical property of the nylon; and when the flame retardant content reaches 5-10%, the cured material can reach the UL94, V-O level.