An electric toothbrush rotating replacement head device includes a toothbrush replacement head body. The toothbrush replacement head body includes a toothbrush handle and a toothbrush head, the toothbrush handle defines a cavity, the toothbrush head is disposed on a top of the cavity, an inside of the cavity is provided with an elastic connecting rod, a bottom of the elastic connecting rod is provided with a spring limiting disc, a top of the elastic connecting rod defines a first pin hole, the elastic connecting rod is disposed in a compression spring, and the compression spring is disposed on the spring limiting disc. The toothbrush head includes a convex block, the convex block defines a second pin hole, and the elastic connecting rod is inserted into the second pin hole and connected to the toothbrush head through the pin.