The present invention relates to a bi-directional piston double-line type high efficiency pump device for an agricultural chemical sprayer, in which a pumping operation by means of a piston is conducted in a bi-directional double row when agricultural chemicals are sprayed, thereby maximizing efficiency. In addition, the device can be easily manufactured and assembled, and the device enables a high performance pumping operation at a lower cost. Specifically, the present invention is configured as follows: a shaft installation space part (110) is formed in the inner center of a housing body (100), both sides of which are formed to include pumping operation chambers (120), and a plurality of cylinder communication grooves are formed in each of the pumping operation chambers (120) at the right and left sides a plurality of eccentric cam wheels (210) are formed in a multi-stage manner at a rotation shaft (200) installed in the shaft installation space part (100) of the housing body (100) upper and lower link units (300) having rod connection parts (330) of different directions are coupled in each of the cam wheels (210) the rod connection parts (330) each comprise a piston rod (400) and a piston (410) and a cylinder fixing unit (500), a pumping cylinder (700) and a cylinder cap unit (600) are assembled and coupled by means of a batch fixing means (800) outside the pumping operation chambers (120) at the right and left sides of the housing body (100), in which a plurality of pumping operation chambers (120) are formed.La présente invention concerne un dispositif de pompage à rendement élevé du type à double rangée de pistons bidirectionnelle pour un pulvérisateur chimique agricole, une opération de pompage étant réalisée au moyen dun piston dans une double rangée bidirectionnelle lorsque des produits chimiques agricoles sont pulvérisés, ce qui permet de maximiser le rendement. De plus, le dispositif peut être facilement fabriqué et assemblé, et ce dispositif permet de ré
