An end effector instrument, comprising: an end effector device, the end effector device comprising an effector portion configured to perform a specified operation and an accommodation portion configured to partially accommodate the effector portion, the accommodation portion comprising a first connecting portion, and a delivery device connected to the end effector device, the delivery device being configured to deliver the end effector device to a target region where the specified operation is to be performed, the delivery device includes an operation portion and a delivery pipe, the operation portion being configured to drive the effector portion to perform the specified operation, the operation portion including a shaft, the delivery device includes a second connecting portion, the second connecting portion being positioned at a distal end of the delivery pipe, characterized in that the accommodation portion includes an inner pipe and an outer pipe, at least a portion of the outer pipe fitting snugly over the inner pipe, when an end of the shaft enters into the inner pipe, the second connecting portion is connected to the first connecting portion, and the delivery device is connected to the end effector device, and when the end of the shaft retracts from the inner pipe, the second connecting portion is disconnected from the first connecting portion, and the delivery device is disconnected from the end effector device. an end effector device, the end effector device comprising an effector portion configured to perform a specified operation and an accommodation portion configured to partially accommodate the effector portion, the accommodation portion comprising a first connecting portion, and a delivery device connected to the end effector device, the delivery device being configured to deliver the end effector device to a target region where the specified operation is to be performed, the delivery device includes an operation portion and a delivery pipe, the operation portion being configured to drive the effector portion to perform the specified operation, the operation portion including a shaft, the delivery device includes a second connecting portion, the second connecting portion being positioned at a distal end of the delivery pipe, characterized in that the accommodation portion includes an inner pipe and an outer pipe, at least a portion of the outer pipe fitting snugly over the inner pipe, when an end of the shaft enters into the inner pipe, the second connecting portion is connected to the first connecting portion, and the delivery device is connected to the end effector device, and when the end of the shaft retracts from the inner pipe, the second connecting portion is disconnected from the first connecting portion, and the delivery device is disconnected from the end effector device. the accommodation portion includes an inner pipe and an outer pipe, at least a portion of the outer pipe fitting snugly over the inner pipe, when an end of the shaft enters into the inner pipe, the second connecting portion is connected to the first connecting portion, and the delivery device is connected to the end effector device, and when the end of the shaft retracts from the inner pipe, the second connecting portion is disconnected from the first connecting portion, and the delivery device is disconnected from the end effector device.