The invention discloses a construction method of a drilling device for a complex high and steep side slope. The drilling device comprises a drilling
machine support, a drilling
machine base and a drilling
machine; the drilling machine support comprises a sliding plate, a
chassis is arranged on the sliding plate, the front end of the
chassis is hinged to the front end of a platform, a supporting component is hinged to the platform and connected with a
chassis fastener, and the width of the chassis and the width of the platform are adjustable; and the drilling machine comprises a power
distribution system, an
air compression system, a gear, a rock drilling component, a soil drilling component, a
drill rod and a
drill bit. The construction method comprises the following steps of 1, pulling the drilling machine support to a specified position; 2, unfolding and locking the support; 3, adjusting the angle between the chassis and the platform; 4, mounting the drilling machine; and 5, startingdrilling. The device solves the problem that it is difficult to
drill in the complex high and steep side slope, can adapt to various rock-soil body stratums, can cope with complex slope
surface conditions such as concavo-convex surfaces and flourishing forests, is flexible in action and safe and reliable in performance, and can fully cope with existing complex high and steep side slope reinforcement
engineering.