Plug-in mechanism, test device, test method and battery production line

The invention discloses a plug-in mechanism, a test device, a test method and a battery production line. The plug-in mechanism comprises a supporting plate and at least two plug-in connectors, the plug-in connectors are connected to the supporting plate, and at least one plug-in connector can rotate around at least any one of a first axis and a second axis and can move close to or away from the to-be-detected workpiece placement space; each plug connector is switched between a pluggable state and an avoiding state by rotating around at least any one of the first axis and the second axis, the used plug connector is selected by switching the states of the plug connectors, the plug connector in the pluggable state is located at the pluggable position, and the plug connector in the avoiding state is located at the pluggable position. The plugging connector in the avoiding state is in an avoiding position relative to the to-be-tested workpiece placing space. The plug-in mechanism and the test method can be compati