Underground laser detection device

The invention provides an underground laser detection device, which consists of two parts: a ground optical control unit and an underground monitoring unit, wherein the ground optical control unit isarranged in a base station, and is responsible for producing laser; the underground monitoring unit is buried underground, and is responsible for transmitting a laser beam produced by the ground optical control unit to a detection region, and transmitting the laser beam back to the ground. The underground laser detection device provided by the invention is a piece of optical detection technology-based pipeline detection equipment, and as a monitoring means, the internationally most advanced gas monitoring technology-laser monitoring technology is applied to detection of underground pipelines for the first time by the underground laser detection device. The underground laser detection device is high in sensitivity and fast in reaction speed, is also capable of detecting out tiny leakage immediately in an instant th