Disclosed is a method of manufacturing a multifunctional surface of low-carbon steel by use of femtosecond lasers. The method comprises the following steps that cutting, grinding and polishing are conducted on a low-carbon steel raw material in sequence, so that a low-carbon steel sample piece is obtained; then ultrasonic cleaning is conducted on the surface of the low-carbon steel sample piece bythe use of deionized water and absolute ethyl alcohol in sequence; the position of a focusing lens is adjusted so that the femtosecond lasers can act on the surface of the low-carbon steel sample piece through the focusing lens; and finally, the processing parameters of the femtosecond lasers are adjusted, and therefore a low-carbon steel sample piece with a super-hydrophobic colored surface or asuper-hydrophobic low-reflection surface is obtained. By the adoption of the method, the low-carbon steel with the super-hydrophobic colored surface or the super-hydrophobic low-reflection surface can be obtained, the structure is stable and reliable, the manufacturing working procedure is simple, the controllability is high, and repeatability is high.