Cationic polyester cotton-like fiber and preparation method thereof

The invention discloses a cationic polyester cotton-like fiber and a preparation method thereof, the cationic polyester cotton-like fiber comprises a dyeing device, the dyeing device comprises an unwinding roller, a cleaning mechanism, a dyeing mechanism, a drying mechanism and a winding roller; the cleaning mechanism is arranged between the unwinding roller and the dyeing mechanism and is used for cleaning the polyester filament yarns before dyeing; the dyeing mechanism comprises a dyeing support, a spray dyeing assembly and a uniform twisting assembly, and the spray dyeing assembly and the uniform twisting assembly are arranged on the dyeing support. The spray dyeing assembly comprises an upper dyeing piece, lower dyeing pieces symmetrically arranged on the dyeing support and a power transmission part for driving the upper dyeing piece and the lower dyeing pieces to move in the width direction of the dyeing support, and each of the upper dyeing piece and the lower dyeing piece comprises a moving frame, a le