A panel attaching device for attaching a first panel and a second panel comprises a first panel tilting unit for setting the first panel, adjusting the balance of the first panel and lifting up the first panel; a sensor for detecting the balance of the first panel; a second panel setting unit for setting and rotating the second panel, wherein the second panel setting unit is arranged at a predetermined distance from the first panel tilting unit; and a guide moving unit for moving the second panel setting unit to the first panel tilting unit.In the panel attaching device according to the present invention, the balance of the first panel is adjusted and a UV curing agent is applied to the first panel or the second panel after forming a dam, so that the UV curing agent is not overflowed from the panels and the first panel and the second panel can be maintained at a regular interval, thereby being capable of manufacturing high quality of products. Further, all process for attaching is performed automatically in a short time, thereby being capable of decreasing defects and increasing productivity.