The invention relates to a current transformer protection device provided with an arcing board. The device comprises the arcing board and a transformer shell used for accommodating a current transformer (2), wherein a rectangular opening allowing a conductor (3) to pass is formed in the transformer shell, the arcing board comprises an arcing board body (1), a rectangular notch (103) is formed in the arcing board body (1) and is defined by multiple flanges, the flanges are connected with the arcing board body into a whole, the arcing board is attached to the outer wall face of the transformer shell, and the rectangular opening corresponds to the rectangular notch (103). Compared with the prior art, the device has the advantages of being suitable for conductors with various sectional dimensions, simple in structure and process, low in machining cost and the like.