Dust-proof cover of step-by-step motor

The utility model relates to a dust-proof cover of stepping motor. One side of a motor casing is provided with a gap, the gap exposes a connection board which the stepping motor is connected with a circuit, and connected wires are arranged on the connection board; one side that the gap opens to the connection board cover is covered with a dust-proof cover of which the exterior margin of both sides is provided with a coupler body; one side that the dust-proof cover is perpendicular to the extending direction of the wires is provided with a rabbet which opens to the wires in an open state; two side edges of the dust-proof cover are provided with two cross gaps, an unbroken pressing piece is formed, the cross gaps make the pressing piece have pressed elasticity, and the pressing piece can be pressed on the stepping motor by the coupler body on the outer side of the pressing piece; the open end of the rabbet directly bunts the wires to make the wires in a breaking angle, and then extend out the dust-proof cover; the wires are not easy to tear down, and the dust-proof cover is installed more quickly and simply.