The invention discloses an automatic plastic film conveying device which comprises an outer rack, a transfer device and a cutting device, wherein the transfer device is located in a first cavity opened rightward on the right side of the outer rack and the cutting device is located in a sliding cavity in the left side of the outer rack; a gear shell is fixed to the top wall in the first cavity, a mounting cavity is formed in the gear shell, a first rotating shaft is rotatably arranged in each of the front and back end walls of the first cavity, a mounting disc and a first belt wheel located behind the mounting disc are fixed to the first rotating shaft, a second rotating shaft stretching front and back is in fit connection to the rightmost side of the mounting cavity, the stretching end onthe front side of the second rotating shaft is in rotary fit connection to the end wall of the front side of the mounting cavity, the stretching section on the back side of the second rotating shaft is in power connection to a first motor fixedly arranged in the end wall on the back side of the mounting cavity, and a second belt wheel connected to the first belt wheel through a first belt is fixedto the second rotating shaft.