The present invention relates to an agricultural working vehicle including a level control device of a working machinery and, more specifically, to an agricultural working vehicle including a level control device of a working machinery capable of rapidly and accurately controlling the inclination of a working machinery in accordance with the inclination of a frequently changed farmland by changing and controlling an inclination control speed of the working machinery by including a proportional flow control valve when the inclination of the working machinery is controlled by the agricultural working vehicle rolled in accordance with the geographic features of the farmland. According to the present invention, the agricultural working vehicle (1) includes: a connection link (5) installed in a vehicle body (2) of the agricultural working vehicle (1)； the level control device (6) including a hydraulic cylinder (6a) and the proportional flow control valve (6e)； and a control unit (400) controlling a flow rate per unit time, supplied from the proportional flow control valve (6e) to the hydraulic cylinder (6a), thereby changing and controlling the inclination control speed of the working machinery (8) by the level control device (a). The hydraulic cylinder (6a) is installed in the connection link (5) and controls the inclination of the working machinery (8) mounted on the connection link according as the length of the hydraulic cylinder (6a) is changed. The proportional flow control valve (6e) controls the flow rate per unit time of a hydraulic fluid supplied to the hydraulic cylinder (6a).COPYRIGHT KIPO 2020본 발명은 작업기 수평제어장치를 구비하는 농작업차량에 관한 것으로, 보다 구체적으로는 농지의 지형에 따라 롤링되는 농작업차량에서 작업기의 기울기를 제어함에 있어, 비례유량제어밸브를 구비하여 상기 작업기의 기울기 조절 속도를 가변하여 제어함으로써, 수시로 변화하는 농지의 기울기에 따라 보다 신속하고 정확하게 작업기의 기울기를 제어할 수 있는 작업기 수평제어장치를 구비하는 농작업차량에 관한 것이다.본 발명에서는, 농작업차량(1)의 차량본체(2)에 구비되는 연결링크(5)； 상기 연결링크(5)에 구비되어 길이가 가변되면서 상기 연결링크(5)에 장착되는 작업기(8)의 기울기를 조절하는 유압실린더(6a)와, 상기 유압실린더(6a)로 공급되는 작동유의 단위 시간당 유
