Built-in air detector of fresh air system of clean workshop

The utility model discloses a built-in air detector for a fresh air system of a clean workshop, which comprises an air inlet pipeline, an air inlet fan is mounted in the air inlet pipeline, air suction holes are distributed in one side of the air inlet fan and positioned at the upper end of the air inlet pipeline, a mounting ring is mounted at the upper ends of the air suction holes, and a detection pipe is detachably mounted in the mounting ring. A detection contact is installed at the top end in the detection pipe, vent holes are distributed in the detection pipe, a detector body is installed at the upper end of the detection pipe, and a blocking mechanism is installed on the side, away from the air inlet fan, of the exhaust hole. The air in the air inlet pipeline enters the detection pipe, the detection contact detects the treated air in the air inlet pipeline, and when the air quality is detected to be unqualified, the blocking mechanism is controlled to block the air inlet pipeline, so that the unqualifi