The invention is applicable to the technical field of intelligent segmentation of pipeline diseases, and relates to a 
Mask RCNN-based underground drainage pipeline 
disease pixel level detection method, which comprises the following steps of: making an underground drainage pipeline instance segmentation 
data set by utilizing an acquired drainage pipeline 
disease video; a 
loss function and an ROI 
pooling layer in a 
Mask R-CNN 
deep learning architecture being optimized, and a ResNet101 network being used as a pipeline 
disease feature extraction network, so that the detection precision of an instance segmentation 
algorithm is improved; initializing 
network model parameters by using a transfer learning technology, performing a hyper-parameter tuning test on the 
network model, and starting 
network model training; evaluating the performance of the training network model, and analyzing the intersection-combination ratio of the network 
model prediction disease area and the real 
disease area; and judging whether the network model can achieve a pixel-level segmentation effect or not. According to the method, the 
Mask R-CNN instance segmentation framework, the ResNet101 
residual neural network and the drainage pipeline disease 
big data are combined, so that rapid, accurate and automatic identification and positioning of the underground drainage pipeline disease are realized.