Medium-length hole trolley drilling device

The invention relates to the technical field of underground rock drilling, in particular to a medium-length hole trolley drilling device which comprises a base, two supports are fixedly connected to the base, a rotating plate is rotationally connected to the two supports jointly, a through hole is formed in the rotating plate, a drilling assembly is arranged in the through hole, and a drilling hole is formed in the drilling assembly. The drilling assembly comprises a sliding seat, a drilling rod, a first engine, a prism, a screw rod, a second engine and a chain, and an adjusting assembly is arranged on the base; according to the drilling device, a high-pressure water source can be externally connected while drilling is conducted, the water source is sprayed out of the drill bit, the sprayed water flow can eliminate broken stones and dust generated in drilling and can also cover the surface of the drill rod, and therefore the drill rod is cooled in the drilling process, the surface of the drill rod can be prev