An adjustable table may comprise a base, an adjusting unit and a tabletop, and the adjusting unit further has a locating seat, a sliding seat, a spring, a first shaft, a connecting rod and an operating rod. The locating seat has a first top plate, and each of two lateral edges of the first top plate is vertically connected to a first side plate. The first shaft is configured to simultaneously couple with the two first side plates, which significantly improves the stableness of the adjustable table when the tabletop bearing weight.