With the development of the city and the following need of civil construction, many underground lines in the city are required to be constructed, replaced or renovated, which leads to the fast growth of researches on trenchless technology. Horizontal directional drilling rig, the most common equipment used in the trenchless pipe-paving, is improved rapidly both at home and abroad in recent years. But currently, most of them are middle or large type in our country which can not meet the needs of some special construction conditions such as the busiest street of the city, narrow lawn or garden, too crowd for the large rig to be fixed on. And in other special engineering need to cross railway, highway or river, the revetment of the railway or the bank of the river cannot also provide suitable space for large rig to work. In those conditions mentioned above, a mini type horizontal directional drilling rig is needed. A mini rig designed in this paper is simple, light, conveniently dismounting and moveable easily and can be disassembled into 4 units whose weight is no more than that of the motor to meet those special engineering. At same time, just a small shaft, 600×1600×800mm in size, can well meet the need of this rig drilling.
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