The invention discloses a composite material NOL loop test spline cutting device which comprises a base, an electric cutting machine, a linear guiderail, a guiderail sliding block, a worktable and a locking device, wherein the electric cutting machine and the linear guiderail are arranged on the base; the guiderail sliding block is matched with the linear guiderail and capable of reciprocating along the linear guiderail; the worktable and the locking device are arranged on the guiderail sliding block. The composite material NOL loop test spline cutting device is simple in structure and convenient to operate; according to the composite material NOL loop test spline cutting device, the cutting time is only 1/10 of the original cutting time and even less, the cut spline incisions are smooth, burr-free and crack-free, the tested spline is small in size deviation and high in precision and the potential safety hazards in the cutting process are avoided.