A die coater inspection device for inspecting a die coater comprising a first die, a second die, and a shim formed between the first die and the second die, the die coater inspection device comprising: a rail; and at least one sensor assembly configured to move along the rail and inspect a lip or the shim of the die coater, wherein the sensor assembly comprises: a movable part moving along the rail in the longitudinal direction of the die coater; and a sensor module connected to the movable part, configured to move in a thickness direction (R1, R2) of the die coater and inspect the lip or the shim, and comprising a distance detection sensor configured to measure a height of the lip or the shim, wherein the rail is formed to be fixed long on one surface of the first die in a longitudinal direction of the die coater, and in that the sensor module further comprises a position detection sensor configured to detect a position of the lip and wherein the position detection sensor comprises at least one of a fiber optic sensor, a photo sensor, a proximity sensor, or a vision sensor; andthe distance detection sensor comprises at least one of a laser displacement sensor or an ultrasonic displacement sensor and wherein the shim comprises:at least one guide configured to divide an internal space between the first die and the second die into a plurality of spaces; and a base configured to connect ends of the guide to each other and extending in a longitudinal direction of the die coater, wherein the position detection sensor is configured to move along a first path in which the guide is not present; and the distance detection sensor is configured to move along a second path in which the guide is present. a rail; and at least one sensor assembly configured to move along the rail and inspect a lip or the shim of the die coater, wherein the sensor assembly comprises: a movable part moving along the rail in the longitudinal direction of the die coater; and a sensor module connected to the movable part, configured to move in a thickness direction (R1, R2) of the die coater and inspect the lip or the shim, and comprising a distance detection sensor configured to measure a height of the lip or the shim, wherein the rail is formed to be fixed long on one surface of the first die in a longitudinal direction of the die coater, and a movable part moving along the rail in the longitudinal direction of the die coater; and a sensor module connected to the movable part, configured to move in a thickness direction (R1, R2) of the die coater and inspect the lip or the shim, and comprising a distance detection sensor configured to measure a height of the lip or the shim, wherein the rail is formed to be fixed long on one surface of the first die in a longitudinal direction of the die coater, and in that the sensor module further comprises a position detection sensor configured to detect a position of the lip and wherein the position detection sensor comprises at least one of a fiber optic sensor, a photo sensor, a proximity sensor, or a vision sensor; andthe distance detection sensor comprises at least one of a laser displacement sensor or an ultrasonic displacement sensor and wherein the shim comprises:at least one guide configured to divide an internal space between the first die and the second die into a plurality of spaces; and a base configured to connect ends of the guide to each other and extending in a longitudinal direction of the die coater, wherein the position detection sensor is configured to move along a first path in which the guide is not present; and the distance detection sensor is configured to move along a second path in which the guide is present.