The invention discloses a polishing machine with double dust suction devices. The polishing machine with the double dust suction devices comprises a polishing device, a transmission device and a driving device, wherein the driving device drives the polishing device to polish rice grains through the transmission device; a feeding channel is formed in a feeding port of the polishing device, a first dust suction device capable of sucking and removing rice bran powder mixed in the rice grains effectively is arranged on the feeding channel, a discharging channel is formed in a discharging port of the polishing device, and a second dust suction device capable of sucking and removing the rice bran powder generated through the polishing device effectively is arranged on the discharging channel. The polishing machine with the double dust suction devices not only can enable the rice grains to be uniformly polished, but also can reduce the amount of dust generated during the polishing process and improve the polishing quality of the rice grains.