The invention discloses an ultralow frequency liquid mass tuning damper, and relates to the technical field of bridge vibration control. The tuning damper comprises a damping box, a spring set is arranged in the damping box, one end of the spring set is fixed to the damping box, and a mass block is connected with the other end of the spring set; the damping box contains damping liquid internally, the mass block is totally immersed or half-immersed in the damping liquid, the damping ratio of the ultralow frequency liquid mass tuning damper is 3% to 35%, and the inherent frequency of the ultralow frequency liquid mass tuning damper is 0.05 to 0.5 Hz. According to the ultralow frequency liquid mass tuning damper, added mass of the damping liquid can be fully utilized, buoyancy effect of liquid is adopted to be an assistance, while control requirement for structure vibration below 0.5 Hz is met, static elongation amount of springs is reduced by a large margin, quantity of used springs of a damper and mounting space are reduced, and the limiting need of actual construction for damper mounting space is met.