A node localization method, comprising: a) determining a first set of radio signal measurement values that can be received by at least one known-location node of a plurality of known-location nodes (K a, K b, K c, K d), and determining a second set of radio signal measurement values that can be received by a to-be-localized node, wherein the radio signal measurement values comprised in the first set that are received by each known-location node and the radio signal measurement values comprised in the second set are respectively determined according to a radio signal sent by at least one common node; b) determining, according to the radio signal measurement values comprised in the first set that respectively correspond to each known-location node and the radio signal measurement values comprised in the second set, a weighting coefficient corresponding to each known-location node; and c) determining location information of the to-be-localized node according to the weighting coefficient corresponding to each known-location node and location information of each known-location node; and d1) wherein the radio signal measurement value is a radio signal strength value; and d2) the determined weighting coefficient corresponding to each known-location node meets a requirement of the following formula: a i = ∑ k = 1 N 10 − P ki − P k 10 n i ∑ i = 1 M ∑ k = 1 N 10 − P ki − P k 10 n i, d3) wherein P k is a radio signal strength value of a radio signal that is sent by the k th common node and that is received by the to-be-localized node, p ki is a radio signal strength value of the radio signal that is sent by the k th common node and that is received by the i th known-location node, a i is a weighting coefficient corresponding to the i th known-location node, N is a quantity of common nodes, M is a quantity of known-location nodes, and n i is a large-scale channel fading index corresponding to the i th known-location node. a) determining a first set of radio signal measurement values that can be received by at least one known-location node of a plurality of known-location nodes (K a, K b, K c, K d), and determining a second set of radio signal measurement values that can be received by a to-be-localized node, wherein the radio signal measurement values comprised in the first set that are received by each known-location node and the radio signal measurement values comprised in the second set are respectively determined according to a radio signal sent by at least one common node; b) determining, according to the radio signal measurement values comprised in the first set that respectively correspond to each known-location node and the radio signal measurement values comprised in the second set, a weighting coefficient corresponding to each known-location node; and c) determining location information of the to-be-localized node according to the weighting coefficient corresponding to each known-location node and location information of each known-location node; and d1) wherein the radio signal measurement value is a radio signal strength value; and d2) the determined weighting coefficient corresponding to each known-location node meets a requirement of the following formula: a i = ∑ k = 1 N 10 − P ki − P k 10 n i ∑ i = 1 M ∑ k = 1 N 10 − P ki − P k 10 n i, d3) wherein P k is a radio signal strength value of a radio signal that is sent by the k th common node and that is received by the to-be-localized node, p ki is a radio signal strength value of the radio signal that is sent by the k th common node and that is received by the i th known-location node, a i is a weighting coefficient corresponding to the i th known-location node, N is a quantity of common nodes, M is a quantity of known-location nodes, and n i is a large-scale channel fading index corresponding to the i th known-location node.