The invention discloses a double-gear rotating mechanical arm which comprises a transverse rod, rotating gears, drive mechanisms and grabbing mechanisms. The transverse rod is provided with a controller. The two sides of the transverse rod are connected with the drive mechanisms. The grabbing mechanisms are arranged on the drive mechanisms. The controller is electrically connected with the drive mechanisms and the grabbing mechanisms. The double-gear rotating mechanical arm has the beneficial effects that the structure is simple and compact, the production cost is relatively low, use is reliable, energy is saved, the mechanical arm is economical and practical, the working efficiency of people is greatly improved, time is saved, the phenomenon of electric energy wasting can be greatly inhibited, in addition, the labor cost is reduced, marketization utilization and popularization are facilitated, wide application prospects are achieved, the structure is simple, and practicability is high.