The invention relates to the technical field of underground water collection, in particular to a deep underground water collection device and method. The device comprises a hollow pipe, a wellhead box, a retractable device, a connecting device, a positioning device and a one-way water inlet device. A connecting device is arranged on the outer side of the hollow pipe, and an indicator lamp is fixedly connected to the front end of the inner side of the wellhead box. The top end of the well mouth box is fixedly connected with a connecting rope, the other end of the connecting rope is fixedly connected with a copper pipe, the hollow pipe, the copper pipe and a drill bit are arranged. According to the arrangement, after the drill bit is installed on the hollow pipe and drills below the water level, the hollow pipe device is detached, and the drill bit inserts the hollow pipe into a drill hole; and clear and clean underground deep water is collected, the copper pipe is fixedly connected with the inductive probe, the balancing weight and the connecting rope, water samples are collected through the copper pipe. The device is simple in structure, low in cost, easy to construct and free of pollution, and the quality of the collected water samples is guaranteed.