1. An automatic unattended-monitoring visual acuity inspection device, comprising an inspection panel, an inspector and an isolation wall arranged opposite to the inspection panel; wherein the inspection panel comprises a liquid crystal display panel, a lower polarizer and a backlight source successively arranged in a direction from human eyes to the inspection panel; the liquid crystal display panel is configured to display visual display pictures; and the inspection panel further comprises a wireless signal receiver and a processor; wherein the isolation wall is provided with a wireless signal transmitter configured to transmit a visual acuity indication signal collected from a person to be inspected to the wireless signal receiver through a network; wherein the wireless signal receiver is configured to transmit the received visual acuity indication signal to the processor, and the processor is configured to process the visual acuity indication signal and transmit a process feedback to the inspection panel; wherein the inspector comprises a liquid crystal cell, and an outer polarizer and an inner polarizer are provided on an upper surface and a lower surface of the liquid crystal cell, respectively, and a light-transmitting direction of a transmitting axis of the outer polarizer is identical to a light-transmitting direction of a transmitting axis of the lower polarizer of the inspection panel.