The invention discloses a low-friction acrylic-based composite material which is prepared from the following raw materials: 40-50 parts of acrylic powder, 30-50 parts of methyl methacrylate, 0.6-1.0 part of activator, 0.001-0.003 part of inhibitor, 0.25-1.5 parts of initiator and 5-20 parts of polytetrafluoroethylene powder. A preparation method of the composite material mainly comprises the following steps: adding the acrylic powder, the initiator and the polytetrafluoroethylene powder into a mixer, and mixing for 2-5h to obtain a composite material powder mixture; uniformly mixing the methylmethacrylate, the activator and the inhibitor to obtain a mixed solvent; adding the composite material powder mixture into the mixed solvent and stirring and mixing uniformly; then pouring the mixture into a mould; solidifying for 60-15min at a vacuum degree below 10Pa and normal temperature of 20-30 DEG C; demoulding to obtain the low-friction acrylic-based composite material. The preparation method disclosed by the invention has the advantages of normal-temperature preparation, simple technology, convenience in operation and low energy consumption; the prepared low-friction acrylic-based composite material has the characteristics of low friction coefficient, low wear rate and the like and is applicable to the fields such as shaft sleeves and gears.