The invention relates to a diamond disc surface grinding device. The diamond disc surface grinding device comprises a driving mechanism and a grinding mechanism. The driving mechanism is used for driving a diamond disk to rotate. The driving mechanism comprises a driving motor, a rotating piece and a fastening piece. The diamond disk is installed on the rotating piece and coaxial with the rotating piece. The rotating piece can drive the diamond disk to rotate. The fastening piece is used for fixing the diamond disk to the rotating piece. The grinding mechanism comprises a clamp and a grinding tool. The grinding tool can move relative to the radial direction of the diamond disk. The grinding tool is installed on the clamp. The grinding tool makes contact with the surface of the diamond disk so as to grind the surface of the diamond disk. The diamond disc surface grinding device makes the diamond disk surface grinding precision improved. Rotation of the diamond disk and the radial movement of the grinding tool are simultaneously performed, the grinding process can be accelerated, grinding time can be shortened, and grinding efficiency can be improved.