Differential protection device and engineering machinery

The invention relates to the technical field of engineering machinery, and discloses a differential protection device and the engineering machinery. The differential protection device also comprises a differential control unit besides a differential electromagnetic valve and a differential rocker switch, wherein the differential rocker switch is used for controlling the power on or power failure of the differential electromagnetic valve; and the differential control unit is used for determining whether a vehicle steers or not when the differential electromagnetic valve is powered on and making the differential electromagnetic valve in a power failure state when the vehicle is determined to be steered. By using the differential protection device provided by the embodiment of the invention, the steering state of the vehicle can be detected by a left position sensor and a right position sensor when a differential lock is in an unlocked state, namely when the differential electromagnetic valve is powered on; when