Auxiliary automatic positioning mechanism for tumor radiotherapy seed implantation

The invention discloses an auxiliary automatic positioning mechanism for tumor radiotherapy seed implantation. The auxiliary automatic positioning mechanism comprises a base, a horizontal linear module, an arc-shaped guide rail, an arc-shaped sliding module, a vertical linear module, a support arm, a cradle head, a steering engine and a template; the horizontal linear module is installed on the base, and a sliding block I moving left and right is arranged on the horizontal linear module; the lower end of the arc-shaped guide rail is fixedly connected to the sliding block I, and the horizontal projection of the arc-shaped guide rail extends in the front-and-back direction; the arc-shaped sliding module is installed on the arc-shaped guide rail; the vertical linear module is installed on one side of the arc-shaped sliding module, and a sliding block II moving up and down is arranged on the vertical linear module; the support arm laterally stretches out, and the upper end of the support arm is fixedly connected