The utility model provides a novel diluted acid concentration meter detects device. Its technical scheme is: a novel diluted acid concentration meter detects device, includes diluted acid concentration meter, detection barrel, purified liquor outlet pipe, filter layer, diluted acid inlet valve, thick liquid blowoff valve, the diluted acid passes through the inlet valve and gets into detection barrel through filtering layer filtration post -cleaning impurity, regulation inlet valve and blowoff valve acquisition stability velocity of flow. The beneficial effects are that: can obtain the cleaning, stabilize the detection medium of the velocity of flow, realize automatic accurate the detection.