The invention discloses a desk with a height adjusting function. The desk comprises a desktop and desk legs and further comprises height adjusting devices. Each height adjusting device comprises an upper swing arm, a lower swing arm and a worm mechanism. One end of each upper swing arm is hinged to the desktop, and gears are arranged at the other ends of the upper swing arms. The gears are engaged with the worm mechanisms, one end of each lower swing arm is hinged to the corresponding desk leg and gears II are arranged at the other ends of the lower swing arms and engaged with the worm mechanisms. Height adjustment is carried out in an assembling mode of a screw rod and the gears. When height adjustment is needed, a worm is rotated, so that the gears drive the upper swing arms and the lower swing arms to rotate, and then the height of the desktop changes. The worm has good self-locking performance, and under the condition of normal use, the height of the desktop cannot change. The desk is used as a child desk.