The invention relates to the field of engineering machinery, and discloses a control system and method for engineering machinery and the engineering machinery. The control system comprises a main valve, an electric proportional valve set and a controller. The main valve is used for controlling an executing mechanism of the engineering machinery to act. The electric proportional valve set comprisesa first electric proportional valve and a second electric proportional valve. The first electric proportional valve is connected with a first lateral cavity of the main valve. The second electric proportional valve is connected with a second lateral cavity of the main valve. The electric proportional valve set is used for outputting different voltage to control a valve core of the main valve to move. The controller used for outputting different pulse width modulation signals to the first electric proportional valve and the second electric proportional valve of the electric proportional valveset according to electric signals output by a left operation handle and a right operation handle of the engineering machinery. The control method is simple and flexible, hydraulic impact of the hydraulic system can be reduced, and therefore stable running of the whole engineering machinery is achieved.