The invention discloses a communication system and a vehicle wireless charging device. The communication system comprises a primary converter located in a capital construction side, and a secondary converter located in a vehicle-loaded side. The communication system comprises a primary winding, a primary antenna and a primary controller which are all located in the capital construction side. The vehicle wireless charging system also comprises a secondary winding, a secondary antenna and a secondary controller which are all located in the vehicle-loaded side. The currents and voltages transmitted in and inducted between the primary winding and the secondary winding all contain zero-crossing information. The primary controller detects the zero-crossing condition of the current and voltage of the primary converter, and when a zero-crossing is detected, sends or receives digital signals through the primary antenna. The secondary controller detects the zero-crossing condition of the current and voltage of the secondary converter, and when a zero-crossing is detected, the digital signals are sent and received through the secondary antenna. The technical scheme enhances the stability of the communication system.