Prefabricated drainage ditch

The utility model discloses a prefabricated drainage ditch which comprises a drainage ditch body, a plurality of cover plates are arranged at the top of an inner cavity of the drainage ditch body, an installation mechanism is arranged between the drainage ditch body and the cover plates, the installation mechanism comprises two supporting blocks, a plurality of fixing rods are fixed to the upper surfaces of the supporting blocks at equal intervals, and installation holes are formed in the middles of the two sides of the cover plates. An inner cavity of the mounting hole is connected with the fixing rod in a sliding and penetrating mode, a limiting mechanism is arranged on the cover plate, and a cleaning mechanism is arranged below the cover plate. The cover plate is moved to the top of the inner cavity of the drainage ditch main body, so that the fixing rod is inserted into the inner cavity of the mounting hole, then the limiting rod is moved into the inner cavity of the middle through groove, one end of the