Learning from the Internet is becoming more and more convenient and attracting more and more people.How to obtain knowledge from massive data and construct high quality knowledge graph has become a research hot topic.This paper proposes a new method of knowledge graph construction based on crowd-sourcing.Firstly,learners build the subgraphs to acquire knowledge through the crowd-sourcing task;secondly,we put forward the fusion strategy of knowledge subgraph,in which knowledge graph is converted into the adjacency matrix,and the weight of the knowledge relation is calculated by matrix operations,thus knowledge graph is constructed.Finally,experiments conducted on an open platform show that the accuracy and integrity of proposed method of constructing knowledge graph are higher and our new method exists potential value for online learning and self-regulated learning.