The invention provides an amplitude adjustable vibrating agitation tank. The amplitude adjustable vibrating agitation tank comprises a rack, an agitating tank, an agitating motor, an agitating shaft,an elastic coupler, an agitating bearing block, a cushion block, a transmission bearing block, a transmission shaft, a transmission belt pulley, a transmission motor, a transmission motor belt pulley,a transmission belt, a transmission disc, a connecting shaft, a connecting shaft sleeve, an agitating axle seat and an agitating axle seat pin, wherein the transmission shaft is arranged in the transmission bearing block in a penetrating manner; the transmission belt pulley is arranged at one end of the transmission shaft; the transmission disc is arranged on one side of the transmission shaft; the connecting shaft is arranged on one side of the transmission disc; the connecting shaft sleeve is arranged at one end of the connecting shaft, the agitating axle seat is arranged at one end of theagitating shaft, and the agitating axle seat and the connecting shaft sleeve are assembled through bolts. The agitating tank has strong agitation effect, adjustable vibrating agitation amplitude and high agitating efficiency.