The relative deprivation of income among chronically ill patients may create a perception of inequity in their access to quality healthcare, which may lead to a decline in patients' trust and further increases the burden of chronic diseases. Digital finance could be the antidote. To promote equity in healthcare delivery, this study explores the mitigating effect of digital finance by elucidating the relationship between relative deprivation of income and chronically ill patients' trust. Using data from the China Family Panel Study, a Poisson regression model was applied to assess the effect of relative deprivation of income on chronically ill patients' trust. A marginal effect analysis was used to verify the effect and a two-stage least squares method was used to test robustness. Chronically ill patients' trust was at a medium level (5.98 ± 2.05). Relative deprivation of income significantly reduced patients' trust (β=-0.056, p < 0.1). The digital finance had a positive effect on patients' trust (β=0.035, p < 0.01) and alleviated the negative effect of relative deprivation of income on patients' trust (β=0.105, p < 0.01). The instrumental variable estimation results confirmed the robustness of the benchmark regression results. The inequity resulting from relative deprivation of income undermines patients' trust. Digital finance has a long-term effect on alleviating perception of inequity among chronically ill patients. The government should promote the integration of digital finance and smart healthcare to enhance patients' trust and contribute to equality in healthcare delivery. Limitations include self-reported data and an insufficient correlation between selected indicators and healthcare services.