Hardware testing device, vehicle-mounted system and testing platform

The invention discloses a hardware testing device, a vehicle-mounted system and a testing platform, the hardware testing device comprises a power supply conversion unit, a to-be-tested hardware machine cage, an acquisition control unit and a communication interface unit, the power supply conversion unit respectively supplies power to the to-be-tested hardware machine cage, the acquisition control unit and the communication interface unit; a plurality of slots for mounting to-be-tested hardware are parallelly designed in the to-be-tested hardware machine cage, the upper computer can test the to-be-tested hardware through an interface integrated by the communication interface unit and then analyze a result through the acquisition control unit, the acquisition control unit can also test the to-be-tested hardware, and the to-be-tested hardware is tested through the analysis result of the upper computer. The communication interface type and the slot position which are integrally designed can reduce the constructio