As an underlying computer vision task, blind image quality assessment plays an important role in image evaluation. According to the Human Vision System (HVS), when observing an image, people's visual attention will be more sensitive to the region of their concern, which shows that attention mechanism is very helpful for image quality assessment. Therefore, in blind image quality assessment, many attention mechanisms were used to extract the features of concerned regions. However, most of the existing methods only cascaded multiple attention mechanisms to extract features, which greatly weakened the effect of the fusion of multiple attention mechanisms. Based on this, we propose a multi-attention fusion convolution neural network (MAFCN), which can extract the features of interest region from different aspects. In this network, a multi-attention fusion unit (MAFU) is proposed which can adaptively fuse three types of attention mechanisms and give full play to the ability of each attention mechanism to extract features. In addition, skip connections are added to the network to supplement local information and missing details. Experimental results show that MAFCN has better performance and strong generalization ability without wasting resources.