The invention provides a low-density
flame-retardant
polypropylene foam material and a preparation method thereof, and relates to the technical field of
polymer foam materials. The foaming material is obtained by performing
supercritical fluid foaming on a
flame-retardant
polypropylene material. The
flame-retardant
polypropylene material comprises the following components in parts by weight: 50-70 parts of polypropylene, 15-35 parts of a flame retardant, 1-6 parts of a
smoke suppressant, 0.5-1 part of a
lubricant, 5-10 parts of a
toughening agent, and 0.3-1 part of an
antioxidant. According to the low-density flame-retardant polypropylene foam material obtained by foaming through a
supercritical fluid technology, the flame retardant property can reach UL941.6 mm V0 level, the advantages of high foaming ratio, excellent
mechanical property,
high cell density, fine
apparent mass, smoothness and the like can be ensured, and the problem that in the prior art, a high-foaming-ratio flame-retardant polypropylene foam material is difficult to prepare is fully solved.