The invention provides an automatic smear pushout device which comprises a smear storage box, a guide rail, a sliding block, a synchronous belt, an infrared sensor, a support, a pushing rod, a base and a motor. The front portion and the back portion of the pushing rod are each provided with a chamfer, the pushing rod moves forwards from the initial position of the edge of the guide rail, and then a to-be-detected smear located at the bottom inside the smear storage box can be pushed out and conveyed to the detection position; when the pushing rod is reset backwards and passes through the lower portion of the smear storage box, the to-be-detected smear can be jacked up and not be pushed out, and the pushing rod is reset and returns to the initial position. According to the automatic smear pushout device, the automated structure running process is rapid and simple, whether the detecting smear exists or not is judged through the infrared sensor by simulating manual actions, and then intelligent operation is achieved; the working efficiency is greatly improved, the operation process of workers is simplified, manual operation errors are avoided, and the workers have more time to do other things.