The invention discloses a clamping groove assembly type connecting steel frame which comprises a steel column, a steel beam and connecting nodes. The steel column and the steel beam are fixedly connected through the connecting nodes; the connecting nodes comprise first connecting mechanisms and second connecting mechanisms which are fixedly connected; the first connecting mechanisms are fixed ona column body of the steel column, the second connecting mechanisms are fixed to the end portions of the steel beam; the first connecting mechanisms are arranged on the edge of the steel column; the second connecting mechanisms comprise main plates and side plates, the side plates are respectively arranged on two opposite sides of the main plates, a space formed by the first connecting mechanismsis used for placing the main plates, and the side plates are fixedly connected with the first connecting mechanisms; and a large amount of on-site welding work is avoided, and the welding quality andthe mounting precision of component positioning can be ensured.