An oscillating range adjusting module for use in an oscillating sprinkler, being connected between a water inlet module and an oscillation driving module, the oscillating range adjusting module comprising: a first adjusting unit, comprising: a first circular-shaped substrate; a first circular-shaped peripheral wall, being formed on a top surface of the first circular-shaped substrate; and a first arc-shaped perforation groove, being formed on the first circular-shaped substrate; and a second adjusting unit, comprising: a second circular-shaped substrate, a top surface thereof being connected to a bottom surface of the first circular-shaped substrate; a second circular-shaped peripheral wall, being formed on a bottom surface of the second circular shaped substrate; and a second arc-shaped perforation groove, being formed on the second circular-shaped substrate; wherein the first adjusting unit further comprises: a hollow cylinder member, being formed on a center of the first circular-shaped substrate for use in connection with an inlet tube of the water inlet module; and at least one combination platform (10P1, 10P2), being connected to peripheral sides of a bottom end of the hollow cylinder member; wherein the second adjusting unit further comprises: at least one snapping member (10C1, 10C2), being formed on the top surface of the second circular-shaped substrate and being configured for being engaged with the at least one combination platform (10P1, 10P2), when the second circular-shaped substrate is connected to the first circular-shaped substrate; and a combination hole, being formed on a center of the second circular-shaped substrate and being adopted for connecting between the bottom end of the hollow cylinder member and a water inlet port of the oscillation driving module. a first adjusting unit, comprising: a first circular-shaped substrate; a first circular-shaped peripheral wall, being formed on a top surface of the first circular-shaped substrate; and a first arc-shaped perforation groove, being formed on the first circular-shaped substrate; and a first circular-shaped substrate; a first circular-shaped peripheral wall, being formed on a top surface of the first circular-shaped substrate; and a first arc-shaped perforation groove, being formed on the first circular-shaped substrate; and a second adjusting unit, comprising: a second circular-shaped substrate, a top surface thereof being connected to a bottom surface of the first circular-shaped substrate; a second circular-shaped peripheral wall, being formed on a bottom surface of the second circular shaped substrate; and a second arc-shaped perforation groove, being formed on the second circular-shaped substrate; a second circular-shaped substrate, a top surface thereof being connected to a bottom surface of the first circular-shaped substrate; a second circular-shaped peripheral wall, being formed on a bottom surface of the second circular shaped substrate; and a second arc-shaped perforation groove, being formed on the second circular-shaped substrate; wherein the first adjusting unit further comprises: a hollow cylinder member, being formed on a center of the first circular-shaped substrate for use in connection with an inlet tube of the water inlet module; and at least one combination platform (10P1, 10P2), being connected to peripheral sides of a bottom end of the hollow cylinder member; a hollow cylinder member, being formed on a center of the first circular-shaped substrate for use in connection with an inlet tube of the water inlet module; and at least one combination platform (10P1, 10P2), being connected to peripheral sides of a bottom end of the hollow cylinder member; wherein the second adjusting unit further comprises: at least one snapping member (10C1, 10C2), being formed on the top surface of the second circular-shaped substrate and being configured for being engaged with the at least one combination platform (10P1, 10P2), when the second circular-shaped substrate is connected to the first circular-shaped substrate; and a combination hole, being formed on a center of the second circular-shaped substrate and being adopted for connecting between the bottom end of the hollow cylinder member and a water inlet port of the oscillation driving module. at least one snapping member (10C1, 10C2), being formed on the top surface of the second circular-shaped substrate and being configured for being engaged with the at least one combination platform (10P1, 10P2), when the second circular-shaped substrate is connected to the first circular-shaped substrate; and a combination hole, being formed on a center of the second circular-shaped substrate and being adopted for connecting between the bottom end of the hollow cylinder member and a water inlet port of the oscillation driving module.