Vehicle-mounted charging connection device and power supply system

The embodiment of the invention provides a vehicle-mounted charging connection device and a power supply system. An in-vehicle charging connection apparatus includes: a support portion configured to support an electronic device; and a plug portion connected and electrically coupled to the support portion. The plug portion is adapted to be at least partially inserted into a power supply base in the vehicle to support the support portion and includes: a plurality of symmetrically arranged electrical connection terminals arranged to supply power to the electronic device via the plug portion and the support portion in a first plug mode and a second plug mode, the first insertion mode indicates that the insertion part is inserted into the power supply base in a first insertion posture and is electrically connected with the power supply base, the second insertion mode indicates that the insertion part is inserted into the power supply base in a second insertion posture and is electrically connected with the power supply base, and the first insertion posture is different from the second insertion posture. In this way, according to the embodiment of the invention, the identification and charging functions of the electronic equipment can be realized with a small number of pin terminals, a user can be reminded and restrained after the electronic equipment is accessed, and the user experience and the riding safety are improved.