PURPOSE: A non-power siphon hold unit is provided to stably maintain the siphon without a separate external power and sub facility using a siphon principle even if the water is not provided. CONSTITUTION: A non-power siphon hold unit comprises a siphon portion(30), a U-shaped control pipe(40), a water level control pipe(41) and a discharge guide pipe(42). The siphon portion comprises a horizontal pipe(32), an inflow pipe(31) and an outflow pipe(33). In the U-shaped control pipe, one side is respectively combined in the bottom of the inflow pipe and inlet tube and the other side is opened. The water level control pipe is connected to the opened other side of the U-shaped control pipe connected to the inflow pipe of the siphon portion and adjusts the length according to the administration water level.
