The invention discloses a system for an automatic test on cathode disbonding resistance of an anticorrosive coating of a steel pipe. The invention relates to the technical field of general corrosion protection and pipe systems. The system comprises a special-purpose voltage data collection card, a current data collection card, a PCI bus, a host computer, a variable resistance box, voltage/current data acquisition probes, a direct-current power supply, a baking oven, test tanks, an electrolyte and electrodes. The electrolyte is poured into the test tanks in a temperature controllable system by being controlled by a valve. The platinum electrode, the calomel electrode and the current data acquisition probe are inserted into the electrolyte. A test piece is arranged on the bottom of the test tank. The platinum electrode passes through a variable resistance and then is connected to the anode of the direct-current power supply. The cathode of the direct-current power supply is connected to the test piece. The special-purpose voltage data collection card and the current data collection card are connected to the host computer of an analysis control system by the PCI bus. The voltage data acquisition probe is connected to the end of the calomel electrode. The system provided by the invention has functions of control, acquisition and storage and can efficiently, accurately and objectively produce test data.