A ventilator system. The ventilator system comprises: a ventilator (100) having a first side provided with a first port (10)； a humidifier (300) having a second side engaging with the ventilator (100) and provided with a second port (30)； and a connection device (200) provided on the first side of the ventilator (100) or the second side of the humidifier (300) and used to connect the first port (10) of the ventilator (100) with the second port (30) of the humidifier (300). The connection device (200) comprises: a first port, a second port and an airflow channel connecting the first port with the second port, wherein when the humidifier (300) is separated from the ventilator (100), the connection device (200) is capable of rotating from a connection position connecting the first port (10) and the second port (30) to a closed position for preventing foreign objects from falling into the first port and the second port. The ventilator system resolves an issue in which foreign objects can easily fall into connection ports of a ventilator (100).
