The utility model discloses an orbital sander convenient to rolling power cord, the reciprocating impact tunnel drilling machine comprises a machine body, the bottom of fuselage is connected with thebottom plate, and the outside cover of fuselage is equipped with dust -blocking cover, two abrasive paper of bottom plate top installation press from both sides the both sides that are located the fuselage respectively, the top of fuselage is fixed with the spliced pole, the wire winding groove has been seted up respectively to the both sides of spliced pole, and installs wiring area and I -shapedknot on the side of spliced pole, one side of being located the wiring area is detained to the I -shaped, and the I -shaped detains including T type piece and base, T type piece is located one side of base, the internally mounted of spliced pole has the motor, and the top of spliced pole is connected with the handle, the inside that the heavy heart fan of connecting is located the fuselage is rotated through the pivot to motor one end. The utility model discloses set up the dust -blocking cover of funnel type, in the course of working, accessible dust -blocking cover prevents a large amount of dust that produce to rise, makes it directly sink, prevents the dust pollution operational environment that rises.