The invention discloses an atomizing and dust removing device in a casting workshop. The atomizing and dust removing device comprises a three-way joint and a water supply pipe, the three-way joint isconnected to the top of the water supply pipe, and the atomizing and dust removing device is characterized in that: the water supply pipe is provided with an electromagnetic control valve, a water storage tank is connected to the lower side of the water supply pipe, and a water level sensor is arranged on the inner wall of the inner bottom of the water storage tank; an atomizer is arranged at theinner bottom of the water storage tank, a steam outlet pipe is arranged on the upper left side of the water storage tank, and a steam distribution mouth is formed in the top of the steam outlet pipe;the water level sensor is connected to the electromagnetic control valve through a circuit, an electrical control joint is arranged on the right side of the water storage tank, and the electromagneticcontrol valve can be switched off regularly. The atomizing and dust removing device in the casting workshop has the advantages that dust flying is limited by utilizing water mist to increase the humidity of the air, so that the landing speed of dust is accelerated, the dust is removed so as to purify the air; therefore, the atomizing and dust removing device has the advantages of a large controlarea, a wide range and low use cost.