The invention discloses a method and a device for repairing and enhancing the cover performance of a wireless sensor network, which relate to the field of wireless sensor networks. The method comprises steps: the optimal cover node set in the wireless sensor network is acquired based on an optimal node selection method for an irregular sensing region; according to attributes of each sensor node in the optimal cover node set and the sensing irregularity, the minimal connected cover set in the wireless sensor network is built; and based on the minimal connected cover set, a cover repairing and enhancing method based on connection is used for repairing a cover blind area and a redundant cover area in the wireless sensor network, and the cover performance of the wireless sensor network is improved. Energy is considered as a main factor, cover repairing is carried out based on signal transmission irregularity, sensing range irregularity of nodes in the network and cover connection in the network, and the purposes of saving the network energy, improving the network cover quality and prolong the effective service life of the network are achieved.