The invention relates to an air and air energy recovery and ventilation device with defrosting and bypass air supplying functions, which belongs to an air and air energy recovery and ventilation device and aims at solving the problem that load in a cold energy eliminating chamber applying outdoor fresh air can not be utilized by the traditional air and air energy recovery and ventilation device in a transition season. The air and air energy recovery and ventilation device also comprises a bypass air supplying valve, wherein a fifth air passage hole is communicated with a bypass air supplying passage, one end of a baffle plate is arranged on the inner side wall of a casing and the other end is arranged on a heat exchange frame, a second baffle plate is arranged at the fifth air passage hole and is articulated with the heat exchange frame through a second hinge, one end of a second connecting rod is articulated with the second baffle plate and the other end is articulated with a second sliding block which is connected with an output shaft of a second motor in a transmission way, the second motor is fixedly arranged on the bottom end face of the baffle plate, and a power supply controller is connected with the second motor through a lead. The invention is used for recovering indoor heat and cold energy.