The invention discloses a backpack fan system comprising a fan device, backpack equipment and a connecting device. The fan device comprises a motor, a main fan and an air duct assembly, wherein the main fan is driven by the motor to rotate to produce air flows, the air duct assembly is provided with an air duct to guide the air flows produced by the main fan, and the air duct assembly comprises an air inlet pipe provided with an air inlet, an air outlet pipe provided with an air outlet and a bendable hose connected with the air inlet pipe and the air outlet pipe to enable the air inlet pipe, the hose and the air outlet pipe to constitute the air duct. The backpack equipment comprises straps allowing being worn by a user and an equipment body connected to the straps. The connecting device is connected with the fan device and the backpack equipment, transmits the gravity of the fan device and acting force from the fan device to the backpack equipment and is connected with the air inlet pipe and the equipment body. According to the backpack fan system, the operation burden of the user is relieved, and the operation comfort degree of the user is improved.