The utility model relates to a dust removal device, and in particular relates to a water tank dust removal device. The water tank dust removal device consists of a tank body, wherein water is contained in the tank body; the tank body comprises an air outlet pipe, an air inlet pipe and a sewage discharging pipe; the tank body further comprises a water baffle, a foam baffle, a liquidometer and a water inlet valve; the air inlet pipe of the water tank dust removal device is connected with an air outlet of an industrial dust collector through a pipeline; air with tiny dust enters the air inlet pipe and then enters the water in the dust removal tank through the foam baffle; the air is in contact with the water in a boiling manner, so that the tiny dust is adsorbed by the water and is dissolved to be retained at the bottom of the tank body; air without the dust is discharged from the water level; the foam baffle and the water baffle are used for intercepting foam and water droplets in the air, and then the clean and dust-free air is discharged out of the dust removal tank through the air outlet pipe. Due to the air which is subjected to dust removal and is discharged by the device, zero emission of the dust is realized, and the defect that an existing dust remover is poor in dust removal effect is overcome; furthermore, by the use of water for dust removal, the water tank dust removal device is simple in structure, convenient to operate, low in cost and favorable for large-scale application.