Jointing element

The utility model relates to a jointing element, and particularly relates to a detachable jointing element at a rotation angle. The jointing element comprises a first jointing element and a second jointing element, wherein the first jointing element comprises a first seat plate which is fixedly connected with one or more ear plates; the second jointing element comprises a second seat plate, wherein the second seat plate is also fixedly connected with one or more ear plates; the ear plates of the first seat plate and the second seat plate are crossed with each other and are provided with through holes at corresponding positions, and are connected by pin columns; two sides of ear plates of the second seat plate are provided with round bulges by taking the through holes as circle centers; the ear plates of the first seat plate are provided with grooves corresponding to the bulges. The jointing element is simple in structure, is firm in jointing, can be dismounted, and can rotate at a certain angle in the same plane. According to the utility model, by the arrangement of corresponding bulges and grooves, the mutual deviation between adjacent ear plates in rotation can be prevented.