  In this paper, we construct the Lusztig symmetries for quantum
Borcherds-Bozec algebra $U_q(\mathscr g)$ and its weight module $M\in \mathcal
O$, on which the generators with real indices of $U_q(\mathscr g)$ act
nilpotently. We show that these symmetries satisfy the defining relations of
the braid group, associated to the Weyl group $W$ of $U_q(\mathscr g)$, which
gives a braid group action.
