The invention discloses a full-automatic horizontal surface grinding machine mechanical arm which comprises a machine table and a product containing table. An automatic detection device, a turning device, a cleaning device and a grabbing mechanical arm body are arranged on the machine table. The product containing table and the machine table are arranged side by side. The automatic detection device, the turning device, the cleaning device and the grabbing mechanical arm body are all installed on the machine table, and an automatic grinding machine device is connected with the machine table. By means of the automatic detection device, the turning device, the cleaning device, the grabbing mechanical arm body and the automatic grinding machine device, saw blades are fed, discharged, detected, cleaned and ground in a full-automatic mode, full-automatic operation of the whole process is achieved, and labor cost of an enterprise is greatly reduced; by means of accurate numerical control operation, cost is reduced, the yield is improved, and the production loss rate is reduced; production efficiency is improved, and working time is shortened; by means of full-automatic production, guarantees can be provided for workers on the aspects of mechanical contusion, tiny dust and exhaust gas inhalation and metal dirty water corrosion to human bodies.