The invention discloses a signal debugging device. The signal debugging device is provided with a shell. The shell is detachably divided into a first body part and a second body part. An electrical connection assembly is arranged between the first body part and the second body part and serves as a shaft to make the first body part and the second body part combined and sealed. Detection and analog-to-digital conversion conducted on the actual carrier signal communication process are achieved in single equipment, when a handheld set acquires carrier signals, the handheld set can be immediately inserted into a device body for data conversion, immediate storage and collection analysis can be conducted on the actual effect of carrier communication, and use is convenient. The invention further discloses a split signal debugging device and an electric system scene carrier debugging system.