The present invention discloses a network-transmission inspection method, applied to a network-transmission inspection device, including: connecting a network-connection module with a base station through a network by a network-communication device; checking whether the number of RX packets received by the network-connection module from the base station has increased at a first predetermined time interval when the network-connection module is connected with the base station; checking whether the number of TX packets transmitted by the network-connection module to the base station has increased when the number of RX packets has not increased; checking whether the connection between the network-connection module and the network-communication device is functioning properly when the number of TX packets has not increased; and increasing the network abnormal number by 1 when the connection is not functioning properly.