The invention discloses a fine operation mechanical arm. The fine operation mechanical arm comprises a vacuum suction cup, a funnel type connecting pipe connected to the vacuum suction cup, an air pipe connected to the funnel type connecting pipe, a connecting block fixed to the end portion of the air pipe, a clamping plate assembly rotationally arranged on the connecting block and used for clamping a component, a fixing ring circling the air pipe, and an electronic telescopic rod connected to the fixing ring. According to the provided fine operation mechanical arm, the connecting pipe is arranged between the vacuum suction cup and a baffle, an air opening is shrunk, and therefore the situation that small components enter the vacuum suction cup and damage the vacuum suction cup is effectively avoided, and the service life of equipment is prolonged; the clamping plate assembly can stably fix a product, and the using stability of the equipment is ensured; and through the arrangement of the electronic telescopic rod, products at different heights can be sucked.