The invention relates to the field of capacitive processing equipment, in particular to a circular capacitor upper and lower electrode welding mechanism facilitating clamping. The mechanism comprisesa power distribution control box and a rotary disc which is arranged above the power distribution control box and communicates with the power distribution control box through a support, and clamps areannularly uniformly arranged below the rotary disc. An upper tin wire feeding device, a tin wire welding device, a capacitor turnover device, a lower tin wire feeding device and another tin wire welding device are sequentially arranged on the outer side of the rotary disc in the clockwise direction and are connected to the power distribution control box. The circular capacitor upper and lower electrode welding mechanism facilitating clamping is provided with the disc, the product clamps are arranged on the disc, and the upper tin wire feeding device, the tin wire welding device, the turnoverdevice, the lower tin wire feeding device and another tin wire welding device are sequentially arranged on the disc in the clockwise direction, so that automatic turnover of circular capacitors is achieved, the welding efficiency is greatly improved, and the production time is saved.