The invention discloses a warning mark using unsaturated composite epoxy resin materials, which is of rectangular columnar structure. The four sides at the top of the rectangular columnar structure also form a slope structure which inclines towards the center of the column. Red reflection sticks and white reflection sticks are arranged on the rectangular columnar structure alternately. The warning mark is manufactured by the following materials: 45% of unsaturated composite epoxy resins, 40% of continuous glass fiber bundles, 10% of curing agents and 5% of coloring agents. The invention has the characteristics of high brightness, long life, difficult deformation, strong bearing capacity, corrosion resistance, good loss prevention property, rich colors and good capability of beautifying the environment. As the warning mark has the advantages of light weight, high strength and difficult damage, the warning mark can be installed flexibly in a labor and time saving manner. The colors are formed by blending the color paste capable of being compatible with the resins into the resins; therefore, the colors are not shown on the surface, thus keeping the colors lasting.