This paper investigates a new model on coronavirus-19 disease (COVID-19), that is complex fractional SIR epidemic model with a nonstandard nonlinear incidence rate and a recovery, where derivative operator with Mittag-Leffler kernel in the Caputo sense (ABC). The model has two equilibrium points when the basic reproduction number $R_{0} > 1$
R
0
>
1
; a disease-free equilibrium $E_{0}$
E
0
and a disease endemic equilibrium $E_{1}$
E
1
. The disease-free equilibrium stage is locally and globally asymptotically stable when the basic reproduction number $R_{0} <1$
R
0
<
1
, we show that the endemic equilibrium state is locally asymptotically stable if $R_{0} > 1$
R
0
>
1
. We also prove the existence and uniqueness of the solution for the Atangana–Baleanu SIR model by using a fixed-point method. Since the Atangana–Baleanu fractional derivative gives better precise results to the derivative with exponential kernel because of having fractional order, hence, it is a generalized form of the derivative with exponential kernel. The numerical simulations are explored for various values of the fractional order. Finally, the effect of the ABC fractional-order derivative on suspected and infected individuals carefully is examined and compared with the real data.