Pumping boom hydraulic system and engineering machinery

The utility model provides a pumping arm support hydraulic system which is characterized by comprising an oil pump, a plurality of pipelines, a plurality of compensation valves, a plurality of reversing valves, a plurality of proportional valves and a plurality of oil cylinders arranged in parallel. The compensation valve and the reversing valve are communicated with the proportional valve through pipelines; the oil cylinder comprises a rod cavity and a rodless cavity, and the proportional valve is respectively communicated with the rod cavity and the rodless cavity through pipelines. When the pumping arm support hydraulic system of the structure works, pressure oil enters the pipeline from the oil outlet end of the oil pump, then enters the compensation valve, the reversing valve and the proportional valve and finally enters the rod cavity or the rodless cavity of the oil cylinder, compared with a pumping arm support hydraulic system of an existing structure, the pipeline layout is effectively simplified, th