Multi-mode LED lamp string control circuit and LED lamp string

The utility model is suitable for the LED drive control filed and provides a multi-mode LED lamp string control circuit and an LED lamp string. The LED lamp string control circuit comprises a time sequence control circuit board and a drive control circuit board; the time sequence control circuit comprises a clamping voltage-dividing circuit, a first one-chip microcomputer and a flash mode control circuit; the drive control circuit board comprises a plurality of LED drive circuit groups, and each LED drive circuit group comprises a plurality of LED drive modules that are connected in parallel. According to the multi-mode LED lamp string control circuit and the LED lamp string, under the condition that a structure of two power source lines of the lamp string is not changed, electricity is supplied to the LED lamp string through high voltage, single-color or multi-color lamp string can orderly realize a synchronous flash mode, a flowing flash mode and a random flash mode through work frequency change of the one-chip microcomputer; a lamp string segment-change flash automatic demonstration function can be fulfilled through timed resetting, and vitality and diversity of LED lamp string flash can be greatly strengthened.