The invention relates to an electric control device for treating the dyeing of the pure cotton jeans by corona, in particular to an electric control device for treating the dyeing of the pure cotton jean. The electric control device is formed by an upper electrode roll (1), a lower electrode roll (2), a first electrode (3), a second electrode (4), a third electrode (5), a fourth electrode (6), a left end screw rod (7), a right end screw rod (8), a first motor (9), a second motor (10), a first frequency converter (11), a second frequency converter (12), a multi-channel control card (13), a central control computer (14), a corona discharge instrument (15), a third frequency converter (16), a third motor (17), a hood (18), a rear part nip roll (19) and a front part power nip roll (20). The invention has the advantages that the super indigo blue dyeing effect can be greatly improved, the technological process is relative simple, the energy consumption is low, the pollution is low, the operation treatment time is short and the color fastness effect is good.