An electrically controllable seat post is provided. The electrically controllable seat post includes a retractable rod and a switch actuator. The retractable rod includes a switch. The switch actuator is corresponding to the switch and includes a pushing member, an electromagnetic coil and a controller. The pushing member is assembled in the switch actuator, wherein the pushing member is controlled to move to open or close the switch. The electromagnetic coil generates a magnetic force by injecting a current therethrough, wherein the pushing member is moved by the magnetic force. The controller controls the switch actuator.