Soil legacy effects mediate plant-soil feedback and agricultural sustainability. It remains unclear how soil legacy, driven by warming and AMF inoculation, affects the growth and reproduction of subsequent plants. Here, the previous rape crop was subjected to warming and inoculation with arbuscular mycorrhizal fungi (AMF), and the subsequent plant, Impatiens balsamina, was cultivated in the legacy soil of rape. Warming-driven soil legacy significantly increased stomatal conductance (G_s) and intercellular CO₂ concentration (C_i) of I. balsamina by 54.5% and 1.7%, respectively. However, the soil legacy of rape inoculated with AMF significantly decreased G_s, C_i, and the transpiration rate of I. balsamina by 53.4%, 4.47%, and 46.5%, respectively. Chlorophyll fluorescence parameters, such as S_m, PI_inst., and PI_abs. of I. balsamina grown in the soil remaining after warming and AMF inoculation in rape, were lower than those grown in the soil remaining after warming and AMF inoculation in rapeseed. Soil legacy of rape inoculated with AMF significantly increased plant height of I. balsamina by 7.8%, but decreased the seed number per fruit by 17.5%. The number of flowers per plant grown in soil legacy of rape exposed to warming was 61.1% higher than that under ambient temperatures. Soil legacy of rape exposed to warming and AMF inoculation significantly increased soil carbon content by 16.2%, and the C/N ratio of legacy soil exposed to warming was significantly 7.8% higher than that under ambient temperatures. These results suggest that the soil legacy of rape inoculated with AMF promotes vegetative growth of the subsequent plant I. balsamina but inhibits seed production, particularly in warming-driven legacy soil.