The invention relates to an LED writing board lamp. The LED writing board lamp comprises a profile frame and is characterized in that a linear installation groove is formed below the profile frame, an LED light source module is fixed into the linear installation groove, and a linear lens capable of changing the direction of an incident light and enabling the light to irradiate on the upper end and the lower end of the surface of a writing board is installed on the luminous surface of the LED light source module. The LED writing board lamp can effectively improve the irradiating uniformity of the surface of the writing board.