The invention provides an adjustable suction and application anticorrosion device for the internal surface of an oil exploitation pipe. The adjustable suction and application anticorrosion device comprises a chassis, a power box, a first supporting plate, a control box, a coating box, telescopic power pushing frame structures, a rotatable telescopic supporting pipe structure, a detectable rotatingcleaning brush structure, a cleanable spraying frame structure, a programmable logic controller (PLC), a wireless transmission module, a spraying pump, a miniature air pump, a second supporting plate, a rotating motor, a fixing bolt, a supporting pipe and a supporting rotating pipe. The power box is in bolted connection with the middle position of the lower end of the chassis. By arranging the chassis, the first supporting plate, a connecting rod, a telescopic pipe, an adjusting bolt and a rubber wheel, the adjusting bolt is beneficially loosened during working, then the telescopic pipe is pulled up and down, the rubber wheel makes contact with the inner wall of a pipeline, then the adjusting bolt is tightened, support of equipment is facilitated during working, and the situation that during working, the equipment tilts and affects the working quality is prevented.