  We demonstrate the existence of $P-V$ criticality of the topological
Ho\v{r}ava-Lifshitz(HL) black holes with a spherical horizon $(k=1)$ in the
extended phase space. With the electric charge, we find that the critical
behaviors of the HL black hole are nearly the same as those of van der
Waals(VdW) system. For the uncharged case, the HL black hole has a peculiar
$P-V$ criticality. The critical behavior is completely controlled by a
parameter $\epsilon$, but not the temperature $T$. When $\epsilon$ is larger
than a critical value $\epsilon_c$, no matter what the temperature is, there
will be the first-order phase transition. Moreover, we find that there is an
infinite number of critical points which form a "critical curve". As far as we
know, this is the first time to find this kind of peculiar $P-V$ criticality.
