A display supporting apparatus includes a supporting unit having an adjustable body which includes two pairs of first adjusting grooves, and a support body which includes two pairs of second adjusting grooves. A first adjustment unit includes two first adjustable members extending respectively and movably through top and bottom ends of the support body and respectively abutting against top and bottom ends of the adjustable body. A second adjusting unit includes two sliding rods each movably extending through one pair of the first adjusting grooves and a corresponding pair of the second adjusting grooves, and two second adjustable members each extending through and rotatable relative to the adjustable body.