The invention discloses a detection device for detecting spaces between unqualified bonding pads and a method thereof to realize the space detection of the unqualified bonding pads. The device comprises a space measurement unit for measuring space of the bonding pads in the measure gerber file based on the PCB design software; a space comparing unit for comparing the space of the bonding pads measured by the space measurement unit with the allowable range of production process; and an unqualified bonding pad determining unit for determining the space measured by the space measurement unit unqualified when the measured space of the bonding pads is out of the allowable range of production process after comparison by the space comparing unit. The method comprises the following steps of: measuring the space of the bonding pads by the space measurement unit; comparing the bonding pad space measured by the space measurement unit with the allowable range of production process; and determining the space measured by the space measurement unit unqualified when the measured bonding pad space is out of the allowable range of production process after comparison by the space comparing unit.