The present invention provides a transmission coupling structure of a water tank oxygen supply machine, which is a coupling disc which is arranged by two symmetrical and 90 degree rotation positions, and the two coupling discs are respectively made of plastic material, and the two are respectively made of plastic material. The rubber plate is clamped between the coupling discs； this innovative and unique design enables the creation of the shaft to be quickly disassembled and assembled by radial bolt fastening, which can greatly reduce the weight load and increase the motor. The transmission torque during driving is improved and the electric energy is saved, so that the creation achieves the practical progress of quality improvement.本創作係提供一種水車供氧機之傳動聯軸座結構，其係藉由兩相對稱且互呈90度旋位配置之聯軸盤，該兩聯軸盤分別為塑性材質製成，該兩聯軸盤之間夾迫定位一橡膠片；藉此創新獨特設計使本創作藉由各軸端部藉由徑向螺栓緊固方式可快速拆卸及組裝替換，可大幅減輕重量負載轉動而增進馬達驅動時的傳輸扭力提昇及節省電能，進而使本創作達到品質的提昇之實用進步性者。
