Abstract: A pneumatic powered winch actuating device for tightening a winch using a pneumatic tool. The pneumatic powered winch actuating device includes an air wrench. The air wrench is couplable to an air supply hose. A shaft is rotatably coupled to the air wrench. The shaft has a first portion and a second portion. The first portion is positioned adjacent to the air wrench, and the second portion has a threaded peripheral wall such that threads extend outwardly from the shaft. The air wrench selectively rotates the shaft in a first direction. A winch engaging member includes a casing securely attached to the air wrench such that the shaft extends into the casing. A coupling member has a well extending therein and has a size adapted for releasably receiving and coupling to a cylinder. The cylinder is securely attached to a winch. A rod is integrally coupled to and extends away from the coupling member. The rod extends through the casing such that the rod is rotatably coupled to the casing.