The invention provides a field fertilizing pesticide spraying work belt driving snake-shaped robot, and relates to an agricultural pesticide spraying system which has the adjustable angle of a nozzle, an adjustable spraying amount, is controlled by a plant approximation detector and achieves multiple functions efficiently automatically with one control. The agricultural pesticide spraying system is composed of a belt type motor tractor, the plant approximation detector, a control unit, an energy supply unit, a second section wheel type carriage, medicine solution (liquid fertilizer) delivering units, the nozzle and other parts; all sections of carriages are connected through traction pins, and a liquid absorption pump and multiple sections of the medicine solution (liquid fertilizer) delivering units deliver medicine solutions through soft tubes. The pesticide spraying system has the advantages that driving through the belt is suitable for furrow climbing work; the plant approximation detector controls a switch of the nozzle through a detection signal, which makes spraying more reasonable and more efficient, and reduces pollution; an outer cavity of a 2/3 symmetric spherical cavity is matched by in tangent with a spherical inner cavity sphere, and the adjustable angle of the is big; one controller controls multiple snake-shaped robots, the automatic work degree is improved, and resources are saved.