A height-adjustable table with concealed wiring design is provided herein, which includes table surface, table leg, table foot, driving mechanism, and control device. The table leg is connected between the table surface and the table foot and includes a telescoping tube structure. The driving mechanism includes motor, first threaded rod, and connecting tube. The first threaded rod screwed to one end of the connecting tube and the connecting tube are disposed in the telescoping tube structure. The motor is configured to drive the first threaded rod to alter the length of the telescoping tube structure. The control device includes wiring and a control interface. The wiring is disposed in the telescoping tube structure and spirals around the connecting tube. The wiring transmits power to the driving mechanism and transmits a control signal from control interface to the motor to drive the driving mechanism.