The invention discloses an automatic tube loading machine, which comprises a tube loading machine tube holding disc and a mechanical arm, wherein a motor is connected with the tube loading machine tube holding disc (3) through a coupler (11); and a tube holding station of the mechanical arm is fixed on the tube loading machine tube holding disc (3). The automatic tube loading machine is characterized in that: a tube loading machine mechanical arm lofting device (5) of the mechanical arm can move up and down along a motor shaft; the mechanical arm back and forth movement device (9) arranged on the tube loading machine mechanical arm lofting device (5) can drive a mechanical arm clamping jaw device (10) to hold and release glass tubes to complete tube loading; and a bottle inserting action is accomplished every time a bottom making machine rotating disc (1) rotates an angle. When the automatic tube loading machine is used, the labor intensity is lowered, an operator can manage more bottle making machines, the labor production efficiency is increased, and time consumed by manual tube insertion is saved; and the mechanical structure of the automatic tube loading machine is simple and the automatic tube loading machine is easy to control and maintain.