The invention discloses an installation and butt joint structure between beams and columns of an assembly type building. The installation and butt joint structure comprises two steel beams (1) and steel columns (2) which correspond to the steel beams, the two steel beams (1) are connected and fixed as a whole through a positioning sleeve (3); the inner part of the positioning sleeve (3) is provided with a driving device, the two ends of the driving device are correspondingly provided with radial fixing devices, the driving device comprises a driving shaft (4) which is arranged along the heightdirection of the positioning sleeve (3), the two side faces of the top part of the driving shaft (4) are correspondingly and fixedly welded with first support lugs (5), and the first support lugs (5)are provided with driving connecting rods (6) which are rotationally connected and matched with the support lugs. According to the installation and butt joint structure between the beams and the columns of the assembly type building, the butt joint structure is simple, the connection strength between the positioning sleeve and the steel beams can be effectively improved, at the same time, the connection strength between the steel beams and the haunched beams is improved, and the stability of a node is improved.