System for maintaining constant temperature and constant humidity of elevator

The utility model discloses a system for maintaining constant temperature and constant humidity of an elevator. The system is characterized in that a ventilation pipe (5) which surrounds the inner wall is arranged in a sandwich layer (3), a plurality of thermoelectric units (6) are arranged in the ventilation pipe (5), each thermoelectric unit (6) is tightly attached to the ventilation pipe (5), the ventilation pipe (5) is tightly attached to the inner wall (2) of an elevator compartment, one end of the ventilation pipe (5) stretches out of the top of the elevator compartment to form an air suction port (7), the other end of the ventilation pipe (5) stretches out of the lower part of the elevator compartment to form an exhaust port (8), and both the air suction port (7) and the exhaust port (8) are respectively provided with a fan (9); a heat exchanging fin (10) is also arranged in the ventilation pipe (5), and the heat exchanging fin (10) is arranged on the wall of the ventilation pipe; a temperature sensor