The invention discloses an automatic screen assembling machine. The automatic screen assembling machine comprises a machine box and a protective mechanism fixed on the machine box; an automatic loading device is fixedly installed on the upper surface of a machine box table face, two sides of the automatic loading device are parallelly provided with an undesirable material flinging device and a press fitting loading device, the machine box table face is provided with an installing opening, the press fitting loading device is arranged in the installing opening, the material outlet of the press fitting loading device is connected with an unloading device, the unloading device is arranged under an undesirable material picking device, the upper surface of the machine box is further provided with a press fitting frame, the press fitting frame is arranged in perpendicular to the press fitting loading device, a triaxial mechanical hand and an assembling detecting device are installed on the press fitting frame, and the position, arranged among the automatic loading device, the undesirable material flinging device and the press fitting frame, of the machine box table face is further provided with a screen detecting device. According to the automatic screen assembling machine, the structure is small and exquisite, the manufacture is easy, the operation is simple, the assembling precision is high, the consistency is good, the labor intensity of operating workers is relieved, the personal safety of the operating workers is guaranteed, and the production efficiency is improved.