Underground nonmetal pipeline detection device

The utility model discloses an underground non-metal pipeline detection device, and relates to the technical field of pipeline detection, the underground non-metal pipeline detection device comprises a cart and moving wheels, a marking assembly is installed in the middle of the bottom end of the cart, a worker can open a top cover in advance to fill a storage barrel with colored liquid paint, then the paint drips out downwards through a discharging pipe, and the paint drips into the storage barrel; when the trolley moves, paint dripped downwards through a discharging pipe drips on a sponge block, the paint is adsorbed by the sponge block, when the sponge block is attached to the surface of a ball, an adhesive tape can adhere to the paint adsorbed on the sponge block, and along with movement of the trolley, the ball and the adhesive tape can brush the adhered paint to the ground for adjustment; when the position of the detection head needs to be adjusted, the control switch can be turned on to start the guide