The invention discloses an improved agricultural organic fertilizer collecting device. The device comprises a urine pool fixedly mounted on a machine body, and a urine collecting barrel and a three-head tube fixedly installed in the ground; activated carbon is arranged at the bottom of the urine pool, a sponge mesh is laid above the activated carbon, a urine collecting through tube is arranged atthe upper end of the urine collecting barrel, the three-head tube includes a longitudinal through tube at the upper end and a flow guide tube and a urethral tube at the lower end of the longitudinal through tube, the lower end of the flow guide tube is connected with a sewage discharge system, the urethral tube is fixedly connected with the urine collecting through tube, the lower end of the urinepool is provided with a main tube which penetrates into the ground and is connected with the longitudinal through tube, a valve above the urine pool is installed in the machine body, a sealing plateis movably mounted at the junction of the flow guide tube and the urethral tube through a hinge shaft, a water flow tank is arranged at the junction of the flow guide tube and the longitudinal throughtube, an air flow tube is arranged on the urine collecting through tube at the junction of the longitudinal through tube, and the air flow tube is connected to a heavy pressure device disposed in theground.