The invention relates to a prefabricated wallboard mounting manipulator which comprises a waist rotation module, a large arm module, a wrist module and a vacuum suction cup device. The waist rotationmodule comprises a first swing hydraulic cylinder, a base shell, a shell upper cover, a shell lower cover, a large gear, a pinion, a transmission shaft, a positioning shaft sleeve, bearings and a positioning thread sleeve. The large arm module comprises a waist main body, a lower arm, a second swing hydraulic cylinder, a small shaft, a parallel arm and a limiting block. The wrist module comprisesan intermediate connecting piece, a long shaft, an upper arm, a short arm, a parallel rod, a lower connecting rod, an upper connecting rod, a third swing hydraulic cylinder and a movable platform. Thevacuum suction cup device comprises a mounting platform, a support connecting piece, a fixing connecting piece, a sliding rod, vacuum suction cups, a piston rod and a hydraulic cylinder. The prefabricated wallboard mounting manipulator is simple in structure, convenient to control, high in automation degree, capable of reducing operators greatly and high in working efficiency, and has the characteristics of high positioning precision, good stability, high expandability, high reliability, good safety and the like.