Combined hydraulic valve for commercial vehicle cab follow-up system

The utility model discloses a combined hydraulic valve for a follow-up system of a commercial vehicle cab, which comprises a main valve body, a hydraulic control one-way valve part and a hydraulic control reversing valve part are formed on the main valve body in parallel, and an oil inlet A'and an oil outlet A which are respectively communicated with a rod cavity of an oil tank and a rod cavity of a lifting oil cylinder are arranged on a group of opposite sides of the hydraulic control one-way valve part. The number of the oil inlets A'is two, the number of the oil outlets A is two, and the two oil inlets A 'or the two oil outlets A are connected through oil pipes. An oil inlet B'and an oil outlet B which are respectively communicated with a rodless cavity of the oil pump and a rodless cavity of the lifting oil cylinder are formed in a group of opposite sides of the hydraulic control reversing valve part, the number of the oil inlet B 'and the number of the oil outlet B are both one, the oil inlet B' and the