To understand the relationship between leaf color parameters, pigment content and antioxidant capacity of different colored Amaranthus tricolor L. leaves, seven colorful A. tricolor leaves were collected and analysised in this study. The leaves were divided into 13 types of leaf color tissues according to their colors, and leaf color parameters, pigment contents, biologically active substances contents, and indicators of antioxidant capacity were examined and the correlation and membership function of the above parameters were analyzed. The results showed that there were significant differences in leaf color parameters, pigmentation content, bioactive substance content and antioxidant capacity in the studied 13 leaf color tissues. The L* of different leaf color tissues ranged from 27.78 to 82.22, the a* from –21.93 to 53.14, the b* from 1.00 to 60.33 and the c* from 3.10 to 69.06. The contents of chlorophyll a, chlorophyll b, total chlorophyll, carotenoids were significantly higher in green and purple leaves than in yellow and red leaves. The contents of betalain, total flavonoids and total polyphenols were higher in red and purple leaves than in yellow and green leaves. The a*, the contents of betalain, total flavonoids and total polyphenols were positively correlated with both antioxidant activity indices. The antioxidant capacities of different colored A. tricolor leaves were ranked from high to low in the order of purple, red, green, and yellow A. tricolor leaves.