An activating assembly for a screen door includes an assembly seat securable to the screen door and having a lever movably received in the assembly seat and a first recovery spring a to push the lever back to its original position, a driving rod in connection to the lever such that movement of the lever is able to force the driving rod to cause reaction of a lock device, a base seat securable to the screen door and having a second recovery spring compressibly received inside the base seat and a handle movable relative to the assembly seat and the base seat. The handle has a triangular end abutting the lever such that the movement of the handle is able to force the lever to pivot by the triangular end of the handle and the lock device is activated by movement of the driving rod.