The invention discloses a check gate with function of scouring sand and conducting clear water, comprising a strobe and a sand-scouring box. The strobe consists of an upper part, which is a water conducting door (1), and a lower part, which is a scouring sand door (2). The water conducting door (1) and the scouring sand door (2) are provided with a first moveable pulley (3) and a second moveable pulley (7), mounted on a railway of a gate slot. A first steel wire buckle (4) and a second steel wire buckle (6) which are respectively disposed on the water conducting door (1) and the scouring sanddoor (2) are correspondingly connected to a gate lifting machine. The sand-scouring box (8), the top of which is provided with a netted sand-discharging hole (9), is disposed in front of the strobe. The invention has the advantages that: 1) the principle is clear; 2) with simple structure and operation, a common check gate is designed as combined type, with a sand-scouring box disposed in front ofthe gate; 3) the invention can conduct the clear water into the river and can discharge the sand around the gate, which solve the problem of the common check gate that the silt is taken to the placein front of the gate when water is conducted.