The invention discloses a liquid filling machine for protecting a filling head. The liquid filling machine comprises a box, a stirring cavity is arranged at the upper end of the interior of the box, aliquid discharging pipe is arranged at the middle portion of the lower side of the stirring cavity, a liquid discharging soft pipe is arranged on the lower side of the liquid discharging pipe, a connecting pipe is arranged on the lower side of the liquid discharging soft pipe, the filling head is arranged on the lower side of the connecting pipe, an opening is formed in the lower side of the filling head, a fixing block is arranged on the outer side of the connecting pipe, the left and right ends of the upper side of the fixing block are provided with L-shaped connecting rods, the left and right ends of the lower side of the box are provided with sliding grooves, second motors are arranged at the upper ends of the interiors of the sliding grooves, lead screws are arranged on the lower sides of the second motors and are provided with sliding blocks, the interiors of the sliding blocks are connected with the L-shaped connecting rods, a groove is formed in the lower side of the box, a base is arranged on the lower side of the groove, a conveying belt is arranged on the upper side of the base, an electric control cabinet is arranged at the front end of the left side of the conveying belt, a base plate is arranged on the lower side of the base, a damping mat is arranged inside the base plate, and supporting bases are arranged at four corners of the lower side of the damping mat. Bymeans of the liquid filling machine, liquid filling of the equipment can be effectively facilitated, and cleanliness of the filling head can be effectively guaranteed.