Building process of ore removal trench by adopting filling method in medium-length hole sublevel mining

The invention relates to a building process of an ore removal trench by adopting filling method in medium-length hole sublevel mining and is the improvement on the existing medium-length hole sublevel mining method; a lower triangular ore body of a hanging wall of a middle section is subjected to first layered mining by adopting an access method; and an artificial false bottom which is 1.0m high is formed by filling according to the ratio of 1 to 4 after the first layered mining is finished, and the upper part of the artificial false bottom is cemented and filled according to the ratio of 1 to 20. According to the method, the lower triangular ore body of the hanging wall can be completely recovered; and the artificial false bottom is built by adopting a high-ratio cemented-method, and the loss of crown pillar ore can be effectively avoided when the lower triangular ore of the hanging wall of the middle ore body and lower triangular ore of the lower middle section.