This study aims to investigate the effects of early speech and language cognitive training on the nursing outcomes of children with language impairments and their impact on developmental quotient. From October 2018 to October 2023, the data of 80 children with language impairments treated at our hospital were selected. They were divided into an observation group (n = 40) and a control group (n = 40) based on the treatment plan. The control group received routine rehabilitation training, while the observation group received early cognitive language rehabilitation training. The treatment efficacy of the 2 groups, as well as differences in Gesell Developmental Schedule scores and serum indicators before and after treatment, were observed and analyzed. The treatment efficacy in the observation group was superior to that in the control group (P < .05), with a total effective rate of 92.50% in the observation group. After 6 months of treatment, the scores for adaptability, gross motor skills, fine motor skills, personal-social behavior, and language development quotient in the observation group were (77.41 ± 10.21), (77.15 ± 10.43), (80.43 ± 11.19), (71.14 ± 10.42), and (81.21 ± 12.03), respectively, significantly higher than those in the control group (P < .05). After 6 months of treatment, the mental development index and psychomotor development index in the observation group were (107.28 ± 10.43) and (96.60 ± 9.03), respectively, which were markedly higher than those in the control group (P < .05). After 6 months of treatment, the serum levels of insulin-like growth factor-1, 25-hydroxyvitamin D [25(OH)D3], and gamma-aminobutyric acid in the observation group were (52.43 ± 9.44) ng/mL, (31.45 ± 4.82) ng/mL, and (76.65 ± 10.54) µmol/mL, respectively. These levels were not significantly different from those in the control group (P > .05). The blood flow velocities of the middle cerebral artery, anterior cerebral artery, basal artery, and vertebral artery in the observation group and control group were compared after 6 months of treatment (P > .05). Early speech and cognitive training have shown promising efficacy in the treatment of language disorders, as it can improve developmental quotient in affected children and increase serum levels of insulin-like growth factor-1, 25(OH)D3, and gamma-aminobutyric acid.