The invention relates to an automatic ramie stalk separator, which belongs to the agricultural machinery, and realizes the separation of ramie stalk sticks from ramie leather fibers as well as a squeezing function. The automatic ramie stalk separator comprises a stander, a stalk compression unit, a stick breaking separation unit, a ramie leather fiber squeezing unit and a ramie leather fiber output unit. A ramie stalk conveying unit and the ramie leather fiber output unit are fixed on the stander. Through the collaborative operation of each unit, the conveying of the ramie stalks, the separation of the ramie stick from the ramie leather fibers, squeezing of the ramie leather fibers and the conveying of the ramie leather fibers are realized. Due to the adoption of the automatic ramie stalk separator, the conveying of the ramie stalk, the compression of the stalk, the breaking and separation of the ramie stick and the conveying of the ramie leather fibers are integrated and completed in one step, and automatic separation of the ramie stick from the ramie leather fibers and automatic squeezing operation of the ramie leather fibers can be realized.