Abstract: In order to realize the intelligent control of the pressure and flow of the foam drainage vehicle during pumping, and change the phenomenon of easy damaging and low reliability of the transmission components when the traditional mechanical transmission mode of “belt transmission & manual gearbox” is used, a full hydraulic driving foam drainage vehicle is designed in this paper. The vehicle-mounted diesel engine directly drives the variable displacement pump through the power take-off device of the gearbox, and drives the quantitative motor to rotate through the hydraulic pressure. Then the quantitative motor drives the liquid injection pump. The electro-hydraulic proportional control and PLC technology are used to control the output flow and output pressure of the injection pump. The practical application of 29 well times of foam drainage gas production operation shows that the full hydraulic drive foam liquid drainage truck has high operation efficiency, it significantly reduces the energy consumption, with features of low operation cost, low noise and easy operation.