Mechanical durability of superhydrophobic coating relies on not only the matrix robustness of the coating but also the adhesion stability between the coating and its substrate. Mechanically durable superhydrophobic composite coating of poly(ethyl cyanoacrylate)/SiO2/polydimethylsiloxane (PECA/SiO2/PDMS) was fabricated by pretreating substrate with ethyl cyanoacrylate (ECA) followed by spray-coating composite of PDMS precursors, SiO2 nanoparticles and ECA monomers. In the coating process, the ECAs were in situ polymerized into PECA as an adhesive in between to bind the upper coating with the substrate and inside the composite to strengthen the coating matrix. The as-obtained PECA/SiO2/PDMS coating has strong mechanical stability and excellent superhydrophobicity even after sandpaper abrasion, sand grain impacting, water tumbling over, or acidic/basic solutions corrosion. This adhesive strategy can be applied on all kinds of substrates, providing a facile way to mechanically durable superhydrophobic coatings for expanding the applications.