A signal feedback device for an automotive fastener, comprising an automotive power supply (10), a motor (20), a transmission device (30), an execution rod (40), a signal feedback module (50), and a body control module (60). The signal feedback module (50) is provided with a first feedback loop, a second feedback loop, and a third feedback loop. The first feedback loop is connected in series to a first resistor (53) and a first on-off switch (51), the second feedback loop is connected in series to a second resistor (54) and a second on-off switch (52), and the third feedback loop is connected in series to a third resistor (55). The execution rod (40) is provided with a contact (41), and the corresponding loops are switched on under driving of linear movement of the execution rod (40), to provide different signal feedbacks, i.e., a locking state signal, an unlocking state signal, and a signal of the fastener working state between the locking state and the unlocking state. When the fastener is abnormal or is powered off, an abnormal state signal can be detected, and the body control module (60) can make logic judgment under the different states according to different measured resistance values, so that the situation of misjudgment caused by mixing of single signals is avoided.