The invention provides a motor built-in type high-imitation coupled thumb for a handicapped artificial hand, and relates to coupled thumbs. The thumb in existing artificial hand has the defects of complicated structure, large occupied space, insufficient shape and moving function and inflexible action. The coupled thumb comprises a metacarpophalangeal joint, a proximal joint, a distal joint, a motor component, a circuit board component and a sensor component, wherein the proximal joint is arranged on the metacarpophalangeal joint, and the distal joint is arranged on the proximal joint; the motor component is arranged in the proximal joint; the circuit board component and the sensor component are arranged in the distal joint; the motor component enables the proximal joint to rotate around the metacarpophalangeal joint with a mounting seat under control of the circuit board; and the sensor component is fixedly arranged at the finger prominence end of the distal joint. Due to the arrangement of the built-in motor component, the coupled thumb has the advantages of simple integral structure and small occupied space, the integral structure and function can approach a real human thumb due to the cooperation of the proximal joint, the distal joint, the circuit board component and the sensor component. The motor built-in type high-imitation coupled thumb is applicable to an intelligent robot.