Studies have shown that Nitrate (NO3-) rich beetroot juice (BJ) supplementation improves high-intensity intermittent exercise, its ergogenic effect on taekwondo is yet to be determined. This study aimed to investigate an acute 120 ml BJ (800 mg NO3-) dietary NO3- on simulated taekwondo test compared with placebo (PL). twelve trained male taekwondo athletes (age: 21 ± 3 years, height: 180 ± 2.07 cm, body mass: 64.8 ± 4.0 kg, BMI 19.75 ± 1.17(kg/m2)) completed two experimental trials using a randomized, double‐blind design. 150 min after supplementation and placebo consummation, the number of taekwondo kicks, the number of successful kicks, and rate of perceived exertion (RPE) were recorded in each round of the simulated taekwondo competition. The data were analyzed by the dependent t-test. No significant difference between conditions was observed in the number of taekwondo kicks during each round (p > 0.05). on the contrary, results of the number of successful kicks each round showed that the average of the BJ supplement group is significantly higher than the placebo group (p < 0.05). there were no significant differences in RPE between the two conditions (p > 0.05). It seems that ingestion of BJ has some positive effects on force generation during the taekwondo match although more researches are needed.