The invention discloses a novel organic energy-saving and thermal-insulation material and a preparation method thereof. The thermal material is prepared from the following components in parts by weight: 10 to 15 parts of polystyrene, 8 to 13 parts of polyurethane, 7 to 10 parts of p-tert-pentylphenol, 6 to 10 parts of 2-methyl propenal, 7 to 12 parts of ethyl carbamate, 3 to 6 parts of resochin, 4 to 7 parts of benzyltriethylammonium bromide, 2 to 5 parts of methyldichlorosilane, 5 to 9 parts of chloroprene rubber, 8 to 12 parts of phenolic resin and 15 to 20 parts of diethylene glycol monobutyl ether. The thermal-insulation material has good flame resistance, compressive property and thermal insulation effect, and has good market prospect; the limited oxygen index of the thermal-insulation is 60 to 73%, and the compressive strength is 0.9 to 2.3MPa.