The invention discloses a multi-source information obstacle avoidance device and obstacle avoidance system. A communication unit transmits various environment parameters to a server. The server feedsback a plurality of weights in one-to-one correspondence with the various environment parameters according to the various environment parameters. A master control mainboard obtains a discrimination value of a discrimination function of a current obstacle according to the various environment parameters and the weights corresponding to the environment parameters, then carries out fuzzy logic reasoning according to the discrimination value and controls a mobile unit to carry out obstacle avoidance according to a reasoning result. Compared with the prior art, the device and the system have the advantages that the various environment parameters are collected and the fuzzy logic reasoning is carried out through combination of the plurality of weights in one-to-one correspondence with the environment parameters fed back by the server, so the disadvantages existing when the obstacle avoidance is carried out through adoption of single information are avoided; and the corresponding weights are obtained in real time through utilization of the server, so the condition that a recognition accuracy rate is relatively low resulting from a single weight is avoided, the obstacle recognition accuracyrate is improved and an obstacle avoidance effect of the device is further improved.