Supporting leg hydraulic system and engineering machinery

The invention discloses a landing leg hydraulic system and engineering machinery, the landing leg hydraulic system comprises a multi-way valve, the front end of the multi-way valve is connected with a main pressure oil way, and the rear end of the multi-way valve is respectively connected with and controls a plurality of lateral landing leg oil cylinders; the low-pressure oil way is branched from the main pressure oil way and is provided with a pressure reducing valve group for reducing the pressure of the high-pressure oil in the main pressure oil way into low-pressure oil; and the low-pressure oil of the low-pressure oil way supplies and drives the executing mechanism. The engineering machinery comprises the supporting leg hydraulic system and the right front supporting leg serving as an executing mechanism. According to the novel landing leg hydraulic system, stretching and retracting of the landing leg oil cylinders are accurately controlled, the front landing legs are controlled at low pressure, more ene