Disclosed is a radar liquid level indicator calibrating device. The radar liquid level indicator calibrating device comprises a radar liquid level indicator. The radar liquid level indicator is installed inside a storage tank, an installing box is arranged inside the storage tank, a transparent groove is formed in the center of the bottom of the installing box, the top of the radar liquid level indicator can run through the transparent groove, the top end of the radar liquid level indicator is connected with a first gear, a transverse plate is arranged inside the installing box, a first motoris arranged at the lower portion of the transverse plate, the first motor is connected with a rotating rod, the rotating rod is connected with a second gear, the first gear can be meshed with the second gear, a calibration box is arranged inside the storage tank, a calibration plate is arranged inside the calibration box, two vertical plates are arranged inside the calibration box, a transverse rod is arranged between the two vertical plates, one end of the transverse rod is connected with a second motor, the other end of the transverse rod is connected with a second bearing, the calibration plate is connected with the transverse rod, a baffle groove is formed in the side wall of the storage tank, a first electric push rod is arranged inside the baffle groove and connected with a baffle. The radar liquid level indicator can be accurately calibrated inside the storage tank, and time is saved effectively on the premise of ensuring the calibration accuracy.