The invention discloses a vertical and horizontal adjustable support, a curtain wall support and a curtain wall construction. The vertical and horizontal adjustable support comprises a support body and a connection assembly which is connected with the support body in a sliding manner; the support body is of a blocky structure, and is provided with a first sliding chute which is horizontally communicated with two ends of the support body; the connection assembly comprises a first connector connected in the first sliding chute of the support body in a sliding manner, and a sliding block fixed at the inner side of the first sliding chute of the support body; one end of the first connector is provided with a second sliding chute for installing the sliding block; the first connector slides in the vertical direction relative to the sliding block; an interspace is left between the first connector and the support body, so that a vertical and horizontal adjustable interspace is provided for the first connector; the first connector slides in the directions of the left side surface and the right side surface which are vertical to the support body relative to the support body. The vertical and horizontal adjustable support, the curtain wall support and the curtain wall construction, disclosed by the invention, are reasonable in design, simple in structure, and can be greatly popularized and applied to the market.