The utility model discloses a lifting desk which comprises an upper supporting leg and a lower supporting leg. The upper supporting leg is arranged in an inner cavity of the lower supporting leg. A clamping assembly which is arranged between the upper supporting leg and the lower supporting leg comprises a locking piece and an expansion sleeve. So long as the locking piece on the upper supportingleg is unscrewed, the upper supporting leg can slide upwards or downwards from the inner cavity of the lower supporting leg. When the needed height is reached, the locking piece is screwed up so as tolead the expansion sleeve to fix the upper supporting leg with the lower supporting leg, and the lower supporting leg is folded with the clamping assembly as the center. The lifting desk has the following advantages: the structure is simple, the operation is convenient, the clamping assembly cannot be easily aged, the using performance is ensured, and the desk is beneficial for being used by students in growth.