Global climate warming commonly affects the invasion risk of exotic plants, and diverse different warming scenarios can affect their growth and other traits. Although seed emergence is among the key stages of life cycle of plant populations, little is known about how different climate warming affects the seed emergence of invasive plants. We conducted a simulated climate warming experiment at Chengdu, in which the invasive forb Eupatorium adenophorum and its native congener E. heterophyllum were subjected to three warming treatments: day-warming, night-warming, daily warming. We recorded the seed emergence every day and then analyzed how different warming scenarios affected it of the two species. Compared with the controls, three warming ways reduced the emergence rate of E. heterophyllum, and the emergence followed the order: day-warming < daily warming < night-warming. For Eupatorium adenophorum, night-warming increased its seed emergence, day-warming decreased it, and no emergence was found in the daily warming. Overall, simulated warming had greater effects on Eupatorium adenophorum than on E. heterophyllum. Additionally, there were linear relationships between the emergence rate of these two species and accumulated air temperatures, and the effects of different warming ways on these linear relationships were variable. Our findings suggest that the nighttime-based climate warming may be advantageous for E. adenophorum to enhance its invasion risk, and the opposite may be true in the day-warming, particularly in the daily warming.