Medicament-based agricultural, aquaculture and landscape wastewater treatment system

The utility model provides an agricultural, aquaculture and landscape wastewater treatment system based on chemicals, and relates to the problems that when an existing agricultural, aquaculture and landscape wastewater treatment system is used, chemicals cannot be conveniently added, the added chemicals cannot be taken out in a contact mode when the chemicals do not need to be added, and the chemicals cannot be taken out when water flow is large. The medicine filtering device comprises a main body, a filtering part and a mounting part, the two ends of the main body are respectively provided with two connecting pipes, the top end of the main body is provided with two filtering pieces, each filtering piece is of an L-shaped structure, the bottom of each filtering piece is provided with three mounting pieces, and each mounting piece is mounted between two mounting plates. When the flowing speed of the wastewater is high, the wastewater can be in contact with the dosing piece, so that the dosing piece can be stre