The invention relates to an automatic material tray lifting device which comprises a first lifting mechanism, a second lifting mechanism, a material moving mechanism and a material piling frame, wherein the first lifting mechanism drives a material tray to move upwards; the second lifting mechanism drives the material tray to move downwards; the material moving mechanism is used for horizontally moving the material tray from the first lifting mechanism to the second lifting mechanism; a first material tray guiding channel and a second material tray guiding channel are arranged vertically inside the material piling frame; the first lifting mechanism and the second lifting mechanism are arranged at the lower portions of the first material tray guiding channel and the second material tray guiding channel correspondingly; the material moving mechanism is arranged on the outer side wall of the material piling frame; and the material moving mechanism comprises a pair of clamping plates moving horizontally on the top of the first material tray guiding channel and on the top the second material tray guiding channel correspondingly. According to the automatic material tray lifting device, the material piling frame is introduced; the first lifting mechanism, the second lifting mechanism, the first material tray guiding channel, the second material tray guiding channel and the material moving mechanism are integrated into the material piling frame; and the structure is small and exquisite, installation is fast and convenient, and the automatic material tray lifting device is suitable for equipment with a compact inner space.