The utility model discloses an electric precipitator and an ash removing mechanism of the electric precipitator. The ash removing mechanism comprises two ash removing brushes arranged at two sides of a dust collecting anode plate, and further comprises a pivoting member pivoted with a shell of the electric precipitator through a pivoting shaft, wherein the ash removing brushes are respectively arranged at two ends of the pivoting member, and a moment generated by one of the two ash removing brushes to the pivoting shaft is more than that of the other one. Compared with the prior art, the ash removing mechanism has the advantages of realizing that the pivoting member rotates relative to the pivoting shaft through ensuring that the moments of the two ash removing brushes to the pivoting shaft (fulcrum) are different and by utilizing a lever principle so as to ensure that the ash removing brushes are always tangent with corresponding dust collecting surfaces of a dust collecting anode, thereby solving the problem that gaps between the ash removing brushes after being worn and the dust collecting surfaces can not be adjusted in the prior art, removing a power element used for driving the ash removing brushes to rotate and a rotary sealing connection structure of the ash removing brushes and the shell, so that the integral manufacture, maintenance and operation costs of the electric precipitator are reduced, and the risk of gas leakage on rotary sealing connection parts is eliminated.