Using data from Chinese A-share listed companies for the period 2007–2022,we investigates the impact of financialization on the long-term use of short-term debt (LUSD). Our findings reveal that increased financialization leads to a stronger issue of LUSD. Financialization squeezes long-term investments and equity financing levels of firms, thereby leading to LUSD. Moreover, the rise in financing costs and the degree of financing constraints intensify the effects of financialization on LUSD. The smaller the scale of the enterprise, the shorter its operating period, the higher its operational risk, the greater the promoting effect of financialization on LUSD.