The water lamp contains a main member, a base, an upper seat, and an agitation element. The base and the upper seat are joined to a top end and a bottom end of the main member, respectively. The agitation element is housed in the main member. Inside the base, there is an illumination element and a magnetic axle controlled by a control circuit. The agitation element is attracted by the magnetism of the axle and spins along with the axle so as to agitate the fluid inside the main member. The upper seat has an accommodation space for supporting a candle. The agitation element is spun by and along with the axle. The fluid inside the main member is stirred and, through the illumination by the illumination element, interesting and dynamic visual effects are produced.