A channel management method for an all outdoor digital microwave transmission device (104, 108), which completes service transmission through a combination of an all outdoor digital microwave transmission device (104, 108) comprising a Network Processor, NP, (106, 110) and a first Central Processing Unit, CPU, (105, 109) and an Internet Protocol, IP, transmission device (101, 112) comprising a second CPU (102, 113) and a switching chip (103, 114), characterized in that the method comprises: establishing separately an independent network management data channel and an entrusted management data channel between the NP (106, 110) and the first CPU (105, 109) of the digital microwave transmission device (104, 108), wherein the digital microwave transmission device has an independent working mode and an entrusted management mode; in the independent working mode, the independent network management data channel is for a network management data access in a case where the all outdoor digital microwave transmission device is singly used and directly connected with a base station at an access station terminal, and in the entrusted management mode, the entrusted management data channel is used for a control access of the IP transmission device to the digital microwave transmission device in a case where the all outdoor digital microwave transmission device and the IP transmission device are combined and used at a relay station or a convergence station; establishing an entrusted management data channel between the second CPU (102, 113) and the switching chip (103, 114) of the IP transmission device (101, 112); transmitting network management access data of a network device management system aiming at the digital microwave transmission device (104, 108) in the independent working mode by using the independent network management data channel; and transmitting management control data of the IP transmission device (101, 112) aiming at the digital microwave transmission device (104, 108) in an entrusted management mode by using an entrusted management channel between the IP transmission device (101, 112) and the digital microwave transmission device (104, 108), the entrusted management channel comprises the entrusted management data channel between the NP and the first CPU of the digital microwave transmission device (104, 108) and the entrusted management data channel between the second CPU and the switching chip of the IP transmission device (101, 112). establishing separately an independent network management data channel and an entrusted management data channel between the NP (106, 110) and the first CPU (105, 109) of the digital microwave transmission device (104, 108), wherein the digital microwave transmission device has an independent working mode and an entrusted management mode; in the independent working mode, the independent network management data channel is for a network management data access in a case where the all outdoor digital microwave transmission device is singly used and directly connected with a base station at an access station terminal, and in the entrusted management mode, the entrusted management data channel is used for a control access of the IP transmission device to the digital microwave transmission device in a case where the all outdoor digital microwave transmission device and the IP transmission device are combined and used at a relay station or a convergence station; establishing an entrusted management data channel between the second CPU (102, 113) and the switching chip (103, 114) of the IP transmission device (101, 112); transmitting network management access data of a network device management system aiming at the digital microwave transmission device (104, 108) in the independent working mode by using the independent network management data channel; and transmitting management control data of the IP transmission device (101, 112) aiming at the digital microwave transmission device (104, 108) in an entrusted management mode by using an entrusted management channel between the IP transmission device (101, 112) and the digital microwave transmission device (104, 108), the entrusted management channel comprises the entrusted management data channel between the NP and the first CPU of the digital microwave transmission device (104, 108) and the entrusted management data channel between the second CPU and the switching chip of the IP transmission device (101, 112).