Robot, robot charger and robot charging system

The utility model provides a robot, a robot charger and a robot charging system, and the robot charger comprises a charger body which is provided with a first charging contact piece on the surface andis internally provided with a charging circuit; the at least one magnetic sensor is used for detecting the robot and mounted at the bottom of the charger body; and the electrical switch is used for controlling on-off of charging, and is electrically connected with the first charging contact piece, the charging circuit and the magnetic sensor respectively. Whether the robot is aligned or not is detected through the magnetic sensor in the robot charger, when the magnetic sensor detects that the robot is aligned, the electrical switch is closed, the charging circuit charges the robot through thefirst charging contact piece, the purpose of controlling charging is achieved through a simple circuit, and it is avoided that a robot battery is damaged by surge due to electrified contact. The arrangement of the magnetic se