We consider percolation in a multiscale Boolean model. This model is defined as the union of scaled independent copies of a given Boolean model. The scale factor of the $n^{\textrm{th}}$ copy is $\rho^{-n}$. Under optimal integrability assumptions, we prove that no percolation occurs in the multiscale Boolean model for large enough $\rho$ if the rate of the Boolean model is below some critical value.