Anti-pollution dust detection mechanism

The invention discloses an anti-pollution dust detection mechanism. A first laser emitter (3) is arranged on the left wall of a dark room (1), an emitting hole of the first laser emitter (3) points to a bijection hole (2a), a hollow dustproof housing (4) is arranged outside the right wall of the dark room (1), openings are formed in two ends of the dustproof housing (4), the large end of an inner cavity (4a) of the dustproof housing (4) is communicated with the inner part of the dark room (1), a photoelectric sensor (5) is connected to the outer side wall of the small end of an inner cavity (4a) of the dustproof housing (4), and a center line of the photoelectric sensor (5), a center line of the first laser emitter (3) and a center line of the two bijection holes (2a) are positioned on the same straight line. According to the anti-pollution dust detection mechanism, the photoelectric sensor is prevented from being polluted by dust by adopting an airflow-preventing slope; and the concentration of low-concentration dust is detected by using a second laser emitter. The anti-pollution dust detection mechanism also has the characteristics of low reconstruction cost, strong anti-pollution capacity, higher detection precision and the like.