  We investigate the bounce solution in the holographic QCD and electroweak
models with first-order phase transition. The strength parameter $\alpha$,
inverse duration time $\beta/H$, and bubble wall velocity $v_w$ in the
gravitational wave power spectra are calculated by holographic bounce solution.
In contrast to the results of field theory, we find the parameter $\alpha$ is
about $\mathcal{O}(1)$ and $\beta/H$ is about $10^4$, which imply that the
phase transition is fast and strong. The critical, nucleation and percolation
temperatures of the phase transition are close to each other in the holographic
model. In addition, the velocity $v_w$ is found to be less than the sound speed
of the plasma $c_{s}=1/\sqrt{3}$, which corresponds to the deflagration
scenario. For QCD phase transition, the gravitational wave power spectrum can
reach $10^{-13}-10^{-14}$ around the peak frequency of 0.01 Hz, which can be
detected by BBO and Ultimate-DECIGO. For electroweak phase transition, the
gravitational wave power spectrum can reach $10^{-12}-10^{-16}$ around the peak
frequency $1-10$ Hz. Moreover, the primordial black hole is not favorable for
formation due to the large parameter $\beta/H$ and small velocity $v_w$.
