The invention discloses a connecting device special for straddle type monorail carriages. The connecting device comprises a steering device located between the carriages and track beams, the steering device is connected with the carriages separately and then makes contact with the track beams, one carriage of the adjacent carriages protrudes from the side walls close to each other to form load-bearing platforms which are connected with the top of a corresponding damper, a lower traction table is installed on the side wall of the carriage provided with the load-bearing platforms, a traction pin boss is arranged on the lower traction table, the traction pin boss is connected with a bogie, an upper traction table is installed on the side walls, close to each other, of the other carriage, the upper traction table is arranged on the traction pin boss, and the upper traction table is connected with the traction pin boss. By means of a spherical articulated device, longitudinal connection of the carriages is tight, the integrity of the carriages is improved, longitudinal impulse of the carriages is reduced, ride is comfortable, the number of the bogies is reduced, each axle can reach the maximum allowable axle load, weight lightening of the vehicle is achieved, and the energy-saving effect is achieved.