The invention discloses an enhanced type CAN bus data resending method. The method comprises following steps of S1: judging whether data is successfully sent, and if it is, continuing to judge whether the data is successfully sent, or else executing a step S2 to carry out resending judgment; and S2: according to reasons to fail to send data, carrying out resending judgment and different processing. The invention also discloses an enhanced type CAN bus data resending device. According to the invention, by judging reasons to fail to send the data and carrying out different processing, occupied rate of resources of a bus is reduced; bus capacity is increased; jam degree of sending of data is reduced; and detection of abnormity of the bus is quite in time. The enhanced type CAN bus data resending method can be widely applied in CAN bus communication field.