The invention provides a support oil cylinder device which comprises a mounting bracket, a mounting shaft, an oil cylinder, a rotating component and a fixing component; the oil cylinder comprises a first telescopic part and a second telescopic part; the oil cylinder is pivoted with the mounting bracket through the mounting shaft; the oil cylinder can rotate around the mounting shaft; the rotatingcomponent comprises a flexible connecting part, a first mounting plate, a second mounting plate, a first connecting rod and a second connecting rod; the first mounting plate is fixedly arranged on themounting bracket; the second mounting plate is rotationally arranged at the first telescopic part and can rotate around a first rotating point; the middle part of the second mounting plate is pivotedwith the first telescopic part; a first end is fixed to the first mounting plate; after the flexible connecting part surpasses the mounting shaft, a second end is fixed to a first mounting end; a second mounting end is pivoted with a first connecting end; a fourth connecting end is connected with the second telescopic part; the fixing component is used for fixing the relative positions of the oilcylinder and the mounting bracket so as to realize automatic turnover of the support oil cylinder, and thus the support oil cylinder is prevented from having interference with a steering tire.