A method for realizing single and double star-delta connection switching of a motor by using a double-outlet box belongs to the technical field of motor stator winding wiring. Totally 12 lead-out connectors, 4 for each phase, and 3 transition connectors of a three-phase stator winding of a motor are divided into two groups and introduced into two outlet boxes respectively. In the three-phase stator winding, two lead-out connectors are taken for each phase, totally six lead-out connectors are taken for one group into one outlet box, and the remaining two lead-out connectors, totaling six lead-out connectors and three transition connectors are taken for the other group into another outlet box. One per phase is selected from the first group, a total of three lead-out connectors are respectively short-circuited with three transition connectors in another group inside the motor, and the three lead-out connectors are used as external power supply access terminals to connect the lead-out connectors and the transition connectors to realize single-delta connection, single-star connection, double-star connection and double-delta connection of the motor through lead-out connectors and transition connectors.