The utility model discloses a pile foundation settlement monitoring device which is characterized in that a fixing frame is designed at the left end of the device, fixing pins are designed on the twosides of the fixing frame, the fixing frame is connected with a sliding machine through a connecting rod, a control block, an information transmitter, an inclination angle sensor and a battery block are designed in the connecting rod, and the two sides of the sliding machine are connected with fixing sliding ways in a matched mode; the input end of the control block is connected with the tilt angle sensor, and the output end of the control block is connected with the information transmitter. The device has the advantages that the fixing frame is designed at the left end of the device, and thedevice is connected with a pile foundation through the fixing frame; the inclination angle sensor is designed in the connecting rod of the device, when the height of the pile foundation is reduced, the inclination angle is changed, the information transmitting device of the device transmits data information, and the control end is conveniently and timely notified.