The invention discloses a string disassembling and assembling device. The string disassembling and assembling device comprises an installing frame and a pincers body installed on the installing frame through a lifting mechanism; the pincers body comprises a spinning wrench and clamp pincers; the lifting mechanism comprises a sliding rod and a first telescopic driving part, a first sliding rail and a second sliding rail are arranged at the two sides of the installing frame respectively, the two ends of the sliding rod are arranged in the first sliding rail and the second sliding rail respectively, the pincers body is installed on the sliding rod, and the first telescopic driving part is installed between the sliding rod and the installing frame. The string disassembling and assembling device is capable of replacing manpower to complete unscrewing operation on a string lifted up and screwing operation on a string lowered down in small workover operation and has the advantages of being high in adaptability, accurate in centring during string connection, high in efficiency, good in pollution discharge effect, safe and environmentally friendly, and the working position can be adjusted flexibly. The invention further discloses workover operation integrated equipment.