Pediatric cancer is one of the most burdensome chronic diseases, necessitating a variety of severe medical interventions. As a result, the disease and its treatment cause numerous acute and long-term medical, psychological, and socioeconomic strains for young patients and their families. Therefore, psychosocial care using evidence-based interventions (EBIs) before, during, and after medical treatments is essential to ensure that patients receive adequate information and to minimize the adverse emotional and psychosocial impacts such as insecurity, fear, and shame. The present study reports the first promising results of applying cancer-specific psychosocial methods developed in the quality improvement project “My Logbook.” The four assessed tools are specifically designed to adequately prepare pediatric cancer patients for surgery, chemotherapy, radiotherapy, and stem cell transplantation. Self and proxy ratings were used to assess the patients’ subjective knowledge and emotional well-being before and after each intervention session. The results showed that patient-centered interventions using various creative and developmentally adapted methodologies (e.g., psychoeducation, crafting, games) have the potential to effectively enhance patient health literacy (V = 120.5, p <.001, r = 0.33) and well-being as manifested in more positive (slope = 0.121, p =.016) and less negative (slope = − 0.350, p <.001) or neutral emotions (slope = − 0.202, p =.002). These findings highlight the importance of developing and implementing psychosocial tools in pediatric oncology to prevent psychological overload and negative emotions and to increase subjective control beliefs, autonomy, and empowerment. Moreover, the effective application and systematic evaluation of evidence-based psychosocial tools can facilitate the establishment of standardized guidelines for psychosocial care in pediatric oncology. Thereby, the final goal is to ensure the quality of care and to use education to increase the quality of life for all pediatric cancer patients. Trial registration: ClinicalTrials.gov