The invention discloses flame-retarding superfine fiber suede leather with excellent dyeing property and a preparation method of the flame-retarding superfine fiber suede leather. The preparation method comprises the following steps: (1) suede leather base cloth with primary flame retardance is prepared from modified polyurethane as a starting material; then the suede leather base cloth with primary flame retardance is subjected to finishing after super dyeing, and flame-retarding base cloth is obtained; (2) the flame-retarding base cloth obtained in the step (1) is impregnated with a first flame retardant and dried, and flame-retarding suede leather base cloth is prepared, wherein the first flame retardant is of a decabromodiphenyl ethane structure; (3) the flame-retarding suede leather is coated with a second flame retardant in a rolling manner, flame-retarding superfine fiber suede leather with excellent dyeing property is obtained, and the second flame retardant contains a flame retardant 2 which is prepared from the decabromodiphenyl ethane structure and antimony(III) oxide by compounding. The dye-uptake of the base cloth is increased, the dyed base cloth is uniform in color, and the K/S value and the color fastness are high.