Aging and early failure detection method and detection apparatus of solid relay

Disclosed is an aging and early failure detection method of a solid relay. The method comprises the following steps: 1), applying an excitation signal to the solid relay, and an A/D sampling circuit acquiring a voltage drop of a moving connection contact or a voltage drop of a moving disconnection contact, a voltage drop of a moving connection-disconnection fault or a voltage drop of a moving connection-binding fault; 2), an FPGA starting a timer at the rising edge of the excitation signal, when load currents flow through the solid relay, outputting a trigger signal, and when the trigger signal is detected, stopping the timer; 3), the FPGA starting the timer at the falling edge of a pulse signal, a level trigger circuit outputting the trigger signal, and when the FPGA detects the trigger signal, stopping the timer; and 4), storing acquired data in an external storage circuit, and a display displaying a result. The detection apparatus comprises the FPGA, an excitation output circuit, a load power source, a load case, a contact state indicating lamp circuit, a sampling voltage dividing circuit, the level trigger circuit, the A/D sampling circuit, an external data storage circuit, an industrial control computer and a fault alarm. The detection is simple, and the aging detection is rapid, accurate and automatic.