Bottle cap with LED lamp

The invention discloses a bottle cap with an LED lamp. The bottle cap comprises a bottle cap body with a thread on the inner wall, a convex partition plate, a power switch, the LED lamp, a battery, a circuit board, a convex block and a guide groove. The convex partition plate is arranged in the bottle cap body with the thread on the inner wall to divide the bottle cap body with the thread on the inner wall into two cavities. The edge of the convex partition plate is provided with the convex block which is clamped into the guide groove. The LED lamp, the battery and the circuit board are arranged on the top inside the bottle cap body with the thread on the inner wall. The power switch is arranged below the battery and the circuit board and is opposite to the convex partition plate. The bottle cap with the LED lamp has the advantages that the structure is simple, use is convenient, whether the bottle cap is screwed or not can be judged by observing whether the LED lamp emits light or not, and the scene atmosphere can be increased for an entertainment place.