The invention discloses a hole digging machine with a water collecting hole and safe in operating. The hole digging machine comprises an external shell (8), a driving motor (9) and a hole digging drill pipe part (6) driven by the driving motor (9), wherein the driving motor (9) is arranged in the external shell (8), the external shell (8), arranged above the driving motor (9), is internally provided with the water collecting hole (20) in the horizontal direction, the bottom of the right side of the water collecting hole (20) is obliquely provided with a water inlet guide plate (21), the bottom of the left side of the water inlet guide plate (21) is obliquely provided with a water outlet guide plate (22), the water inlet guide plate (21) and the water outlet guide plate (22) are arranged in parallel, so that rain water is collected by the water inlet guide plate (21) to the water collecting hole (20) during raining, then the rain water flows from the water inlet guide plate (21), therefore the heat caused by operating of the driving motor (9) can be taken away, and cooling is conducted.