The invention discloses a control system and method for the movement track of a lazy arm of a container side crane. The control system comprises a first angle sensor and a second angle sensor, wherein the first angle sensor is used for measuring the angle between an upper arm of the container side crane and the plane of a vehicle frame, and the second angle sensor is used for measuring the angle between a lower arm of the container side crane and the plane of the vehicle frame; both the first angle sensor and the second angle sensor are connected with a controller; and the controller controls an upper arm oil cylinder to stretch and retract through a first proportional valve and a second proportional valve correspondingly and controls a lower arm oil cylinder to stretch and retract through a third proportional valve and a fourth proportional valve correspondingly. By adoption of the control system and method for the movement track of the lazy arm of the container side crane, the movement track of a lifting point can be controlled automatically, and accurate locking of a container can be achieved; and the motion speed of the lazy arm can be adjusted according to requirements, shaking of the container is controlled to the maximum extent, and rollover is unlikely to occur.