The invention discloses a wearable activity monitoring device for 3D printing.The wearable activity monitoring device for 3D printing comprises a nylon ankle sleeve and a wristband base body, wherein the nylon ankle sleeve is worn on the foot of a patient, and the wristband base body is worn on the hand of a nursing worker.A button cell, a signal transmitter, a cable, an upper press piece and a lower press piece are fixed in the nylon ankle sleeve, a sensing circuit is formed when the upper press piece and the lower press piece are pressed together, and the signal transmitter outwards transmits a signal and informs the nursing signal.The signal transmitter, a rechargeable battery, a controller and a miniature shaking motor are arranged in the wristband base body, the signal transmitter is in signal communication with a signal receiver, and the controller is connected with the signal receiver and the miniature shaking motor and used for reminding the nursing worker.The wearable activity monitoring device can conveniently monitor the excited and restless patient suffering from an Alzheimer disease, meanwhile uses the tiny precise parts for 3D printing and is very good in comfort.