A bouncing support structure for baby walker includes a tubular stand, an upper housing and a lower housing respectively sleeved on an upper end and a lower end of the tubular stand, wherein the upper housing and the lower housing are selectively and reciprocally moved relative to the tubular stand, and respectively connected to an upper frame and a lower frame of the baby walker. An expandable tube sleeved on the tubular stand. The expandable tube has two opposite ends respectively connected to the upper housing and the lower housing. A resilient device is received in the tubular stand, wherein the resilient device has a first end secured on the tubular stand and a second end secured on the upper housing. The bouncing support structure provides a bouncing function to the baby walker when the upper housing is reciprocally moved relative to the tubular stand.