The invention relates to a colored flame-retardant insulation vulcanized fiber board and a manufacturing technique thereof. On the basis of paper making technology, the main raw material is pulped and dyed, and compounded with many flame retardants, and a production technique combining in-pulp addition and surface treatment is adopted to endow the vulcanized fiber paper with high efficiency, environmental protection and enduring flame retardancy. Meanwhile, the vulcanized fiber board has favorable machining properties (pressure resistance, impact resistance, cutting resistance, scratching resistance, no stratification or blowout under pressure, and the like), and favorable electric insulation properties. The colored flame-retardant insulation vulcanized fiber board is an excellent environment-friendly special-structure multifunctional material. The production technique comprises the following steps: adding flame retardants in the pulp, carrying primary molding, vacuum dehydration and high-temperature hot-press drying, and impregnating the flame retardants on the surface. The invention has the advantages of lower production cost, simple production technique, easy control, low energy consumption and less water and power consumption, can not produce secondary pollution on the environment, and can implement clean production.