Including: the main gas supply line and the gas supply branches connected thereto. The main gas supply line is equipped with an air compressor (10), characterized in that a gas storage tank (12) is also installed on the main gas supply line. The gas supply system further includes: a pressure sensor (13) positioned on the main gas supply line; a controller that receives the sensing results from the pressure sensor (13) on the main gas supply line and controls the start/stop of the air compressor (10); the outlet of the gas supply branch is used to connect a powder tank (21) and a powder truck for transporting powder to the powder tank (21). The powder tank (21) is also equipped with a pressure sensing device, which is connected to the controller's signal. The controller is designed to send an alarm trigger signal or/and control the shut-off of the valve (14) connected to the gas supply branch when the sensing results from the pressure sensing device exceed a preset threshold.Attractiveness Machine