The invention relates to a sulfur hexafluoride electrical equipment hydrogen detector which is characterized by comprising an air channel with an air inlet and an air outlet. The air channel is provided with a needle valve near the air inlet; the air channel behind the needle valve is provided with an H2 sensor and a flow sensor; the output end of the H2 sensor and the output end of the flow sensor sequentially pass through a signal conditioning circuit and an A / D converter, and are then connected with a microprocessor; and the microprocessor is connected with an LCD and a data storage unit. According to the invention, the early fault information related to polyester ethylene, insulation paper and epoxy resin decomposition in the SF6 electrical equipment can be fast and accurately obtained, so as to provide a scientific basis for the fault diagnosis and for the equipment condition-based maintenance.