A colorized-character tyre with ultralow cross sections is disclosed. The tyre comprises an inner liner, a tyre body, a belt ply layer, a crown belt and a tread which are connected in order. The tread is divided into a parting zone, a character design zone and a rim seat zone. The tread in the character design zone comprises sidewall rubber, colored rubber in the sidewall rubber, non-staining sidewall rubber used for covering the colored rubber and wear-resistant rubber connected to the sidewall rubber. The tread in the rim seat zone covers steel wire rings and triangle rubber. A preparing method of the tyre is also disclosed. According to the tyre and the method, colored characters can be produced at side walls of the tyre, the tyre is beautiful in appearance, inner material distribution of a product is reasonable, and the tyre has excellent properties. Through optimizing a formula design of the colored rubber, the colored rubber is bright and beautiful in appearance color and good in adhesion effects with surrounding black rubber, and quality problems such as delamination are not liable to occur.