Prefabricated multi-functional protection well of power cable joint

The invention, which belongs to the technical field of the transmission equipment, discloses a prefabricated multi-functional protection well of a power cable joint. The multi-functional protection well is composed of a lower well base, an upper well lid, a detection tube, and a dustproof warning cover. The lower well base and the upper well lid are semi-cylindrical ones; cable holes and anti-skidhandles are arranged at the two ends of the lower well base and the upper well lid; a monitoring hole is formed in the top; and the lower well base and the upper well lid are buckled and connected mutually by a sealing assembly to form a cylindrical joint protection room having two ends with cable holes. The detection tube is a PVC-material-based circular tube. The dustproof warning cover is a circular stainless steel cover; one end of the detection tube is connected to the upper well lid by threads and the other end of the detection tube is in threaded connection with the dustproof warning cover. According to the in