This paper  investigates $L^{\mathrm{\infty }}$-estimates for the general optimal control problems governed by two-dimensional nonlinear elliptic equations with  ointwise control constraints using mixed finite element methods. The state and the co-state are approximated by the lowest order Raviart-Thomas mixed finite element spaces and the control is approximated by piecewise constant functions. The authors derive $L^{\mathrm{\infty }}$-estimates for the mixed finite element approximation of nonlinear optimal control problems. Finally, the numerical examples are given.