Using a sample of Chinese listed firms for the period 2009 to 2018, we analyze the relationship between the financialization of non-financial corporations (NFCs) and corporate performance from both long-term and short-term perspectives. Our results show that the impact of financialization on firm performance is not simply a crowding-out or pulling effect but rather depends on the type of financial assets held by the firms. The holdings of investment financial assets generally have a pulling effect on both the short-term performance and market expectations of a firm's future profits as proxied by Tobin's Q, but they crowd out the innovation activities that are critical to long-term performance. Although monetary financial assets positively affect corporate profitability, they inhibit the increase of return on invested capital and long-term performance. Additionally, compared with monetary financial assets, investment financial assets play a more important role in promoting short-term performance, although the crowding-out effect on innovation activities is more prominent for investment financial assets. Furthermore, this paper also concludes that compared with manufacturing and non-state-owned enterprises (NSOEs), the role of financialization in promoting the performance of non-manufacturing and state-owned enterprises (SOEs) is more significant.