The invention discloses a method for adjusting the stirring speed of an ice cream machine and the ice cream hardness and the ice cream machine. The ice cream machine comprises a shell, and a chargingbucket, stirring fan blades, a motor, a compressor, an evaporator, a condenser, a cooling fan, a control panel, a power panel and a motor driving plate which are arranged in the shell, wherein the stirring fan blades are arranged in the charging bucket and connected with a driving shaft of the motor; the motor is electrically connected with the motor driving plate; a Hall sensor is arranged in themotor and is used for detecting the rotating speed of the motor in real time and transmitting the rotating speed to the motor driving plate; the evaporator and the condenser are both connected with the compressor through pipelines; the compressor and the cooling fan are both electrically connected with the power panel; the control panel and the motor driving plate are electrically connected withthe power panel; the control panel is electrically connected with the motor driving plate; an operation panel is arranged on the control panel; and the operation panel comprises a stirring speed adjusting key and a hardness adjusting key. The method can freely adjust the ice cream stirring speed and hardness, thus meeting the manufacturing requirements of different types of ice cream.