A calibration tile supplier china automatic fixing device applied to a dust meter, comprising: a dust meter body, the dust meter body has a slot for accommodating the calibration tile supplier china, and two opposite side walls on the slot Each is provided with a through hole, the through hole is perpendicular to the axis of the slot, the outer mouth of the through hole is inserted and fixed with a plug, and the inner mouth of the through hole is movably provided with a top ball, and the top ball and A spring is arranged between the plug rods, one end of the spring acts on the plug rod, and the other end of the spring acts on the top ball, and the top ball partially extends into the slot under the action of the spring force; the head of the Calibration tile supplier china has a chamfer , The two side walls of the calibration tile supplier china are provided with notches corresponding to the top beads, and when the calibration tile supplier china is inserted into the slot, the part of the top beads extending into the slot is accommodated in the notch And form an axial limit for the Calibration tile supplier china.

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