The invention discloses a movable connection structure between adapting parts of a single-arm three-dimensional measurement scriber. The movable connection structure comprises a fixed shaft, a fixed hinge and a rotary hinge, wherein the fixed hinge comprises a concave vane and fixed hinge shaft sleeves arranged on two sides of the concave vane respectively; the rotary hinge comprises a square vane and a rotary hinge shaft sleeve arranged on the square vane; the fixed shaft is inserted into the fixed hinge shaft sleeves and the rotary hinge shaft sleeve. An adjustable hinge simultaneously has functions of positioning and automatic closing; one of the functions can be selected by adjustment according to the need; the hinge only has a hinge joint function in the prior art; through the movable connection structure, the functions of the hinge are enriched; the movable connection structure is extremely convenient to operate and use, simple and compact in structure and stable and reliable in positioning.