Multifunctional sampling box convenient for environmental water quality sampling

The utility model belongs to the technical field of water quality sampling. The utility model relates to a sampling box, in particular to a multifunctional sampling box. The filter comprises a shell,a first filter screen and a rotating rod, a sliding rail is arranged on the outer wall of the shell. Connecting plates are arranged on the inner sides of the sliding rails. A cover plate is arranged at the top of the connecting plate; a movable groove is formed in the inner side of the cover plate; a blocking block is connected to the side of the movable groove; the first filter screen is mountedin the shell; the bottom of the first filter screen is connected with a first threaded pipe; an adjusting screw is arranged on the inner side of the first threaded pipe, a second threaded pipe is arranged at the end of the adjusting screw, a second filter screen is fixed to the bottom end of the second threaded pipe, a clamping sleeve is arranged on the outer side of the second filter screen, a clamping rod is installed on