Dust collecting device used for excavator

The invention discloses a dust collecting device used for an excavator. The dust collecting device comprises a flat car, wherein a water tank is arranged on the upper surface of a car plate of the flat car; a water inlet is formed in the top of the water tank; a water outlet is formed in the side wall of the water tank; a water pump is arranged on the upper surface of the car plate of the flat car; an inlet of the water pump is connected with the water outlet through a pipeline; an outlet of the water pump is connected with an atomizing spray head through a pipeline; a water escape valve is further arranged on the pipeline between the atomizing spray head and the water pump; a power generator is further arranged on the upper surface of the car plate of the flat car; the power generator, the atomizing spray head and the water pump are sequentially connected through a guide wire; the power generator is further connected with a PLC through a guide wire; and the PLC is connected with a display screen through a guide wire. According to the dust collecting device used for the excavator disclosed by the invention, dust concentration in air can be effectively detected through a dust detector, a water spraying device can be automatically started under the control of the PLC, an ultrasonic wave liquid level meter is further arranged in the water tank, and the PLC can shut off or turn on the water pump according to a liquid level condition, so that an operator can be reminded to timely supplement water into the water tank.