The ink containing carbon nanoparticles (CNP), carbon nanotubes (CNT) and TiN nanoparticles were chosen as raw materials, the high voltage electrostatic spraying technology was used to deposite CNT/CNP-TiN coatings on aluminum substrate. The effects of electrostatic voltage, spraying height and spraying amount on the optical absorption properties of the coatings were studied. The results show that when the electrostatic voltage is 9kV, spraying height is 30mm and spraying amount is 35μL, CNT/CNP-TiN coating exhibits excellent optical absorption performance, and the average absorption in the range of 400~1400nm reaches 97.1%. Honeycomb clusters are constructed by TiN nanoparticles, CNT and CNP. Optical cavities of several hundred nanometers to micrometers formed between the clusters and optical cavities of several tens to several hundred nanometers within the clusters can trap lights with different wavebands, and broaden the absorption bandwidth. In addition, TiN nanoparticle, CNT and CNP have good light scattering effect, and most of the scattered light is trapped by the optical cavities, so as to further improve the absorption.