The invention discloses a rocking plate performance testing device of an electric silicon steel plate. The invention comprises: a rocking plate machine; a push jack plate arranged on the rocking plate machine; a feed sensor which is connected with the push jack plate and is also connected a gear reduction unit through a connecting rod and a crankshaft and is used for collecting positive and negative pressure and outputting the pressure from a load signal output terminal; a motor which is connected with the gear reduction unit; a frequency converter which provides a variable frequency power supply for the motor and drives the push jack plate in a mode of simulating manual rocking plate; a signal conversion and collection device which is connected with the load signal output terminal of thefeed sensor and receives and collects the positive and negative pressure; and a processor which is used for processing the collected positive and negative pressure. The invention also provides a rocking plate performance testing method of electric silicon steel plate. The technical proposal of the invention has simple operation, reliable and stable experiment results, adjustable speed of the rocking plate and high measurement accuracy.