A weaving horse assembly for supporting a basket form during construction of a woven basket. The weaving horse assembly comprises a support structure and a clamp arm including a U-shaped frame. The base of the U-shaped frame is rotatably mounted to the support structure such that the clamp arm is movable from a generally vertical position to a generally horizontal position. The U-shaped frame has upper and lower arms each having a free end, with the free end of the lower arm defining a form pole for supporting a basket form and the free end of the upper arm defining a clamp for securing a basket bottom to the basket form.