A diagonal draw bar having a micro ventilation function includes a first lever, a second lever, a retaining lever, a spring, a latching member, and an actuating lever. The first lever defines a first rivet hole, a second rivet hole, and provides a positioning hook. The second lever defines a third rivet hole and connects with the first lever. The retaining lever defines a fourth rivet hole and connects with the retaining lever, the retaining lever defines a through hole. The spring is latched within the through hole. The latching member extends through the spring. The actuating lever is provided with a projection for pushing the latching member upward.
