A trigger-boosting pulling device includes an elongate shank, which receives a backward ram to slidably fit thereon, a suction cup, which is fixed to a rear end of the elongate shank, a hand-operating pump structure, which is fixed to a front end of the elongate shank and includes a T-shaped pull grip that is connected by a connection bar to a piston assembly. The connection bar includes a spring fit thereon for position restoration of the pull grip. The pump cylinder includes a handle mounted thereto. The handle has a trigger that is arranged to drive, via a connection lever, the connection bar. As such, the T-shaped pull grip can be first pulled to induce a suction force to reach an initial level and then the handle is held by a hand and the trigger is pulled to drive the connection lever for doubling the force so as to induce enhanced vacuum suction force in the suction cup.