The invention discloses an environment-friendly foam cotton material and a preparation method thereof. The foam cotton material is prepared from the following ingredients in parts by weight: 20 to 40 parts of epoxy resin, 5 to 10 parts of formaldehyde-flee foaming agents, 2 to 8 parts of polyester polyol, 3 to 8 parts of structure enhancing agents, 2 to 6 parts of foam stabilizers, 5 to 12 parts of carbon black, 4 to 18 parts of chain terminators, 2 to 8 parts of thickening agents, 10 to 20 parts of polytetrafluoroethylene micro powder and 4 to 12 parts of nanometer titanium dioxide powder. The preparation method is simple; the prepared foam cotton material achieves environment-friendly and non-toxic effects; the structural capability is high; the stability is high; the foaming speed is high; the foam cotton quality can be improved.