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The subway control system is a large electrical control system, consisting of many control circuit and logic devices. Safety and accuracy must be ensured before the system is put into operation, so it is an essential procedure to check all electrical cabinets in the control system. While in the past the electrical cabinets were checked by labour, leading to inefficiency and misoperation. In order to improve the levels of efficiency and accuracy, the paper researches and designs a new universal electrical cabinet logic tester, which can provide 1 000 general test points and 10 high-power test points with standard connecter. Meanwhile the operation process is simple with high reliability. The tester has been applied in test of the subway electrical cabinets successfully.