A bidirectional damper comprises a mounting bracket, a tension spring, two damping cylinders and two engaging members; the mounting bracket comprises a first bracket plate, a second bracket plate and a connecting plate connected between the first bracket plate and the second bracket plate, the connecting plate comprises a main body section and extension sections at two ends of the main body section; the damping cylinder, the tension spring and the two engaging members are located between the first bracket plate and the second bracket plate, the damping cylinder and the tension spring are respectively arranged at two sides of the connecting plate, and the two extension sections are bent from the main body section towards the tension spring.