The invention provides a cross frame butt joint device and a cross frame. The cross frame butt joint device comprises an inserting part and a bearing part; the inserting part comprises a first flangeplate and a convex butt joint which is coaxially connected with the first flange plate; the bearing part comprises a second flange plate and a sleeve which is coaxially connected with the second flange plate; an elastic part, a transition part and a concave butt joint which are connected with each other are sequentially arranged in the sleeve from the bottom to the opening; the sleeve comprises combining sections, a locking section and a limiting section, wherein the combining sections are arranged from the bottom to the opening in sequence, and the inner diameters of the combining sections are decreased gradually; the locking section is used for preventing the convex butt joint and the concave butt joint from being separated; the limiting section is used for limiting outward movement of the concave butt joint; two spring plugs used for limiting the movement of the transition part are symmetrically arranged at the positions, close to the bottom, of the combining sections of the sleeve;and annular grooves matched with the spring plugs are formed in the transition part. By virtue of the cross frame butt joint device, separation of a large arm caused by operation errors or accidentalimpact processes can be prevented, accurate and rapid unmanned butt joint is realized, and the butt joint safety and the butt joint efficiency are improved.