Testing device and testing method for air source purification device

The invention relates to a testing device and a testing method for an air source purification device, belongs to the technical field of rail transit equipment testing, and can solve the problems that a test supporting device is lacked and a blow-down valve and an exhaust valve of the air source purification device cannot be detected in the prior art, and the exhaust valve testing device comprises an air pipeline connected with the exhaust valve, a valve and an air inlet; the exhaust valve testing device supplies air through an air inlet, replaces a control box and an electric control valve of a locomotive with a valve, and supplies air to the exhaust valve manually. When the valve is closed, the exhaust valve is in a closed state. After the valve is opened, air is supplied to the exhaust valve, the valve port of the exhaust valve is opened, the exhaust valve reaches an exhaust state, and the exhaust valve exhausts air. According to the blow-down valve testing device, the transformer is used for replacing a po