The invention discloses a solar LED (light-emitting diode) gear early warning device based on a radar ranging technology and relates to a gear early warning device, which solves the problems of large mounting cost and low safety of a current gear indicator. The solar LED (light-emitting diode) gear early warning device comprises a bracket and a lamp-post fixed on the bracket; the top end of the lamp-post is fixedly provided with a control box; the upper end of the control box is fixedly provided with a solar battery panel; a radar device is also fixedly arranged on the lamp-post and below the control box; an LED lamp is arranged on the front side of the control box; a solar controller and a storage battery are arranged in the control box; and the solar controller is electrically connected with the solar battery panel, the LED lamp, the storage battery, and the radar device. The solar LED (light-emitting diode) gear early warning device is convenient to mount, does not need wiring, can be suitable for severe outside environments, can be produced in batch, and has small mounting cost and high safety.