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Early detection of kidney disease is of vital importance due to its current prevalence worldwide. Fluorescence imaging, especially in the second near‐infrared window (NIR‐II) has been regarded as a promising technique for the early diagnosis of kidney disease due to the superior resolution and sensitivity. However, the reported NIR‐II organic renal‐clearable probes are hampered by their low brightness (ϵ_maxΦ_f>1000 nm<10 M⁻¹ cm⁻¹) and limited blood circulation time (t_1/2<2 h), which impede the targeted imaging performance. Herein, we develop the aza‐boron‐dipyrromethene (aza‐BODIPY) brush macromolecular probes (Fudan BDIPY Probes (FBP 912)) with high brightness (ϵ_maxΦ_f>1000 nm≈60 M⁻¹ cm⁻¹), which is about 10‐fold higher than that of previously reported NIR‐II renal‐clearable organic probes. FBP 912 exhibits an average diameter of ≈4 nm and high renal clearance efficiency …