Universal testing device of small transformer

The utility model provides a general testing device for a miniature transformer, which comprises a tester and a locking mechanism, one side of the surface of the tester is provided with a fixing mechanism, the outer side of the tester is sleeved with a shell, and one side of the surface of the shell is provided with the locking mechanism. According to the universal testing device of the small transformer, through the arrangement of the locking mechanism, a tester is embedded into the shell at first, then the tester is pressed downwards, when the tester is completely embedded into the shell, a third reset spring is compressed to the maximum, and meanwhile a supporting piece drives a sliding strip to move downwards; at the moment, a sliding strip is completely embedded into a limiting groove, a second reset spring rebounds to drive a locking block to move towards the upper portion of the tester, meanwhile, a sliding block slides in a dovetail groove, when the second reset spring rebounds to the original state,