The invention provides a cotton picking machine for spinning and relates to the technical field of cotton spinning. The cotton picking machine for spinning comprises a cotton loading disc, a central shaft is arranged at the center of the cotton loading disc, the top of the central shaft is sleeved with an inner ring of a rolling bearing, a cotton picking trolley is fixedly connected to the side face of an outer ring of the rolling bearing, a first power gear is fixedly connected to the top of an outer ring of a rolling gear, a first connecting block is fixedly connected to the top of a first rolling gear, a power device is fixedly connected to the side face of the first connecting block and meshed with a cleaning device, and a first reversing rod is arranged on the side, away from the power device, of the cleaning device and movably connected with the cotton picking trolley. A first fixing bearing and a second fixing bearing are used for clamping a worm wheel rod to the cotton pickingtrolley; when a plastic push block moves to push the first reversing rod or a second reversing rod, the first reversing rod or the second reversing rod pushes the worm wheel rod so that the worm wheelrod can be rotated backward and forward, and the plastic push block can reciprocate on a magnetic rod.