Hydraulic core drilling rig adopt full hydraulic transmission for coring rock samples, dominating geological exploration and geotechnical investigation. They are grouped by mobility, drive structure, drilling depth and application. Based on chassis: Light split hydraulic rigs are manpower-transportable for mountain shallow sampling. Skid-mounted types fit fixed flat construction sites. Crawler hydraulic rigs boast strong off-road capability to navigate mud and slopes. Truck-mounted units realize fast highway relocation for linear engineering surveys. By drive design: Vertical spindle hydraulic rigs are cost-effective for medium-shallow holes. Top-drive power head rigs deliver stepless high torque, compatible with wireline coring for deep hard rock. Power mostly comes from diesel engines for field wild areas without power supply, while electric hydraulic rigs work for low-noise urban foundation testing and underground tunnels. By drilling depth: Light models reach within 150m for geotechnical probing; medium rigs cover 150–600m for mineral prospecting; heavy-duty hydraulic core drilling rigs support over 600m ultra-deep stratigraphic coring. Equipped with triple-tube tools, a premium hydraulic core drilling rig effectively protects broken and loose core samples.