Safety seat for children and with automatic tightness adjustment function

The invention discloses a safety seat for children and with an automatic tightness adjustment function. The seat comprises a seat cushion, a controller, a shielding shed and a safety belt. The seat cushion is fixed to a saddle through a buckle belt, the controller is arranged at the front end of the seat cushion, and a rotation shaft is arranged in the rear end of the seat cushion; a handle is connected to the end of the rotation shaft, a backrest is arranged above the seat cushion, and a tightness adjuster is arranged on the seat cushion; the safety belt is connected to the tightness adjuster, a pressure sensor is arranged on the safety belt, and an airbag is arranged above the backrest; the shielding shed is arranged on the airbag, a temperature and humidity sensor is arranged on the shielding shed, and an indication lamp is arranged at the side edge of the temperature and humidity sensor. The safety seat for children has the advantages that the tightness of the safety belt can be automatically adjusted, th