Coffee concentration adjusting method and coffee machine grinding adjusting device

The invention discloses a coffee concentration adjusting method and a coffee machine grinding adjusting device. The adjusting method comprises the following steps: 1) selecting a coffee menu; (2) according to the menu assignment, the control system calls a gear required by the size of the coffee powder diameter corresponding to the menu assignment in the database; (3) the coffee beans are ground according to the gears; (4) coffee is made, and the TDS value of the coffee is continuously detected at the same time; (5) the control system analyzes the TDS average value of the coffee made this time; (6) if the TDS average value does not conform to the menu assignment value, the control system adjusts and controls the coffee powder diameter gear to a certain value according to the difference value between the TDS average value and the menu assignment value, and meanwhile the gear corresponding to the menu assignment value in the database is updated; and if the TDS average value is consistent with the menu assignmen