Full-field label-free optical angiography is a powerful imaging technique that aids study of cardiovascular diseases in live animal models. Here, we presented a novel method that combined absorption intensity fluctuation modulation imaging with sub-pixel matching based on a normalized cross-correlation algorithm to eliminate blurring of angiograms caused by system drift or biological jitter. Raw images showing absorption difference between red blood cells and background tissue under illumination with low-coherence light were captured and divided into several short image sequences. These sequences were then used for image reconstruction using absorption intensity fluctuation modulation imaging to achieve full-field angiography by isolating dynamic red blood cell signals from the background signal in the frequency domain. All the reconstructed images were then matched with the first reconstructed image using the normalized cross-correlation algorithm and subsequently fused. In vivo angiography near chicken embryo heart was performed to demonstrate the efficacy of our method, and it produced clear, blur-free angiograms with high spatial resolution and signal-to-noise ratio.