Randomness expansion where one generates a longer sequence of random numbers from a short one is viable in quantum mechanics but not allowed classically. Device-independent quantum randomness expansion provides a randomness resource of the highest security level. Here, we report the first experimental realization of device-independent quantum randomness expansion secure against quantum side information established through quantum probability estimation. We generate $5.47times10^8$ quantum-proof random bits while consuming $4.39times10^8$ bits of entropy, expanding our store of randomness by $1.08times10^8$ bits at a latency of about $13.1$ h, with a total soundness error $4.6times10^{-10}$. Device-independent quantum randomness expansion not only enriches our understanding of randomness but also sets a solid base to bring quantum-certifiable random bits into realistic applications.
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