The application relates to the technical field of electric
impact wrenches, in particular to an
impact mechanism transmission device which comprises an
impact shell and a rear end cover buckled on the impact shell, a transmission structure is arranged on the rear end cover; the transmission mechanism comprises a
planet carrier rotatably arranged on the rear end cover, rotation gears are rotatably arranged in the
planet carrier at equal intervals, an inner gear ring part meshing with the rotation gears is arranged on the rear end cover, an output shaft is arranged on the
planet carrier, a driving shaft is rotatably arranged on the rear end cover and inserted into the planet carrier, and a driving gear part meshing with the rotation gears is arranged on the driving shaft. The application has the effects of guaranteeing
assembly convenience and structural strength.