Rock drilling jumbos are widely used in the tunnel construction. In the paper, the reform technologies and system integration technologies of rock drilling jumbos are studied, so as to improve the availability of the rock drilling jumbos and to reduce the construction cost. The reform of the electrical system of rock drilling jumbos is described with emphasis. The main reform of the electrical system of the rock drilling jumbo is focused on the starting system of the pump station and the display system of the rock drilling jumbo. The drilling jumbo reformed has been successfully used in the construction of Yantai LPG storage cavern project in Qingdao. It is demonstrated that the performance of the rock drilling jumbo has been greatly improved, the malfunction rate has been reduced, the readability of the malfunction display has been enhanced, the construction requirement has been satisfied and good economical and social efficiency has been achieved.