Electric toothbrush head connecting structure and electric toothbrush

The invention relates to the technical field of electric toothbrushes, in particular to an electric toothbrush head connecting structure and an electric toothbrush. The invention provides a brush head connecting structure of an electric toothbrush. The brush head connecting structure comprises an output shaft, an elastic limiting structure and a brush head connecting body used for being connected with a brush head. A first limiting groove is formed in the output shaft, a shaft hole is formed in the brush head connecting body, a first inserting part is arranged on the side wall of the brush head connecting body, and the first inserting part is communicated with the shaft hole; the elastic limiting structure comprises a first elastic arm inserted into the first inserting part, and the first elastic arm extends into the shaft hole, can be matched with the first limiting groove and is used for limiting axial movement and radial movement between the output shaft and the brush head connecting body. In the process t