This study's objective was to observe the application effect of psychological counseling intervention based on the WeChat platform for patients with gastrointestinal tumors undergoing chemotherapy with completely implanted venous infusion ports. From October 2022 to December 2023, 110 patients with gastrointestinal tumors undergoing chemotherapy with completely implanted venous infusion ports were selected from our hospital. Patients were divided into 2 groups according to the different types of care. The control group received routine psychological counseling intervention, while the WeChat group received psychological counseling intervention based on the WeChat platform in addition to the routine intervention provided to the control group. A comparison was made between the 2 groups in terms of adverse events, compliance, hope level scores, and changes in coping strategy scores. The WeChat group experienced 7 adverse events, with an occurrence rate of 12.73%, while the control group experienced 17 adverse events, with an occurrence rate of 30.91%. The occurrence rate of adverse events in the WeChat group was significantly lower than that in the control group, showing a statistically significant difference (P < .05). The hope level scores before intervention in the 2 groups were compared (P > .05). Compared to before intervention, both groups showed an increase in scores for life attitude, proactive behavior, intimate relationships, and total scores. The WeChat group had higher scores after intervention compared to the control group (P < .05). The coping strategy scores before intervention in the 2 groups were compared (P > .05). Compared to before intervention, both groups showed an increase in facing scores and a decrease in avoidance and resignation scores (P < .05). After intervention, the WeChat group had higher facing scores and lower avoidance and resignation scores compared to the control group (P < .05). The overall chemotherapy compliance in the WeChat group was higher than that in the control group (P < .05). Psychological counseling intervention based on the WeChat platform can improve the level of hope, promote patients to face the disease with a positive attitude, increase chemotherapy compliance, and reduce the occurrence of adverse events in patients with gastrointestinal tumors undergoing chemotherapy with completely implanted venous infusion ports.