This product is a transformer error detection vehicle. It can be moved and unfolded flexibly, applied frequency voltage to the voltage transformer and measured the voltage error, applied a large current to the current transformer to measure the current transformer error, and realized the automatic measurement and recording of the transformer error data on site. The unit can be equipped with a control room with built-in seats, air conditioners, etc. to improve the environment for operators and instruments. Also equipped with a full-space video monitoring system and a data remote transmission system to realize real-time video monitoring and recording of the test site and test products, and remotely transmit the test data to the control center or users.