A fall arrest assembly for anchoring a fall arresting line to a pair of roof trusses includes a truss mount that has a pair of channels each being integrated into the truss mount. The pair of channels is oriented parallel with respect to each other to insertably receive a beam of a respective one of a pair of roof trusses thereby mounting the truss mount to the pair of roof trusses. An anchor box is integrated into the truss mount and the anchor box has an anchor point which is integrated into the anchor box. In this way the anchor point can have a fall arresting line attached to the anchor point thereby facilitating the fall arresting line to be mounted to the pair of roof trusses.