Testing machine for detecting purification efficiency of purification substance

The utility model relates to the technical field of air purification, and discloses a testing machine for detecting the purification efficiency of purified substances, which comprises a frame, a fan and a sample box, an air duct is arranged in the frame, an opening communicated to the air duct is formed in the outer wall of the frame, and both ends of the air duct are communicated with the outside; the fan is connected with the frame, is arranged in the air duct and is used for driving external air to pass through the air duct and then to be exhausted outwards; the sample box is provided with a cavity used for containing purification substances, the sample box is inserted into the frame along the opening and used for blocking the opening, when the opening is blocked by the sample box, the cavity is located in the air channel, a through hole communicated with the cavity is formed in the sample box, and the cavity is located in the air channel. And the two ends of the through hole are respectively communicated