Abstract: A safety device for a stapling gun including a first switch button having an end pivotally mounted on a housing of a stapling gun, another end of the first switch button having a recess formed with a vertical rod on which is fitted a first spring, an inner side of the housing being provided with an inverted U-shaped member which is located right above the recess, the first spring being arranged between the recess of the first switch button and the inverted U-shaped member, a lower side of the first switch button having a groove, an intermediate portion of the first switch button being formed with a vertical passage which is in communication with the groove, a second switch button being pivotally connected with an end of the first switch button, a second spring being installed to push the second switch button to go outwardly from the groove, the second switch button being contoured to fit into the groove and having a protuberance adapted to fit into the vertical passage, a shaft fitted fitted within the vertic