A method for anti-cold-air control in a fresh air machine, comprising: during a process of switching the fresh air machine from a heating mode to a refrigeration mode, obtaining in real time, a set temperature (T S) and a delivery air temperature (T A) of the fresh air machine, and an external temperature of an indoor heat exchanger of the fresh air machine; obtaining a current outlet wind speed and a set wind speed of the fresh air machine; and adjusting an outlet wind speed of the fresh air machine based on the set temperature (T S), the delivery air temperature (T A), the external temperature of the indoor heat exchanger, the current outlet wind speed and the set wind speed; wherein the adjusting step comprises: determining whether a maximum value (max(T2, T A)) of the delivery air temperature (T A) and the external temperature of the indoor heat exchanger is greater than a first preset temperature value (a) in response to determining that the current outlet wind speed of the fresh air machine is zero; adjusting the outlet wind speed of the fresh air machine to a first wind speed in response to determining that the maximum value (max(T2, T A)) of the delivery air temperature (T A) and the external temperature of the indoor heat exchanger is greater than the first preset temperature value (a), wherein the first wind speed is greater than zero and less than the set wind speed; determining whether the delivery air temperature (T A) is greater than a second preset temperature value (b) in response to determining that the current outlet wind speed of the fresh air machine is the first wind speed, wherein the second preset temperature value (b) is greater than the first preset temperature value (a); and adjusting the outlet wind speed of the fresh air machine to the set wind speed in response to determining that the delivery air temperature (T A) is greater than the second preset temperature value (b). during a process of switching the fresh air machine from a heating mode to a refrigeration mode, obtaining in real time, a set temperature (T S) and a delivery air temperature (T A) of the fresh air machine, and an external temperature of an indoor heat exchanger of the fresh air machine; obtaining a current outlet wind speed and a set wind speed of the fresh air machine; and adjusting an outlet wind speed of the fresh air machine based on the set temperature (T S), the delivery air temperature (T A), the external temperature of the indoor heat exchanger, the current outlet wind speed and the set wind speed; wherein the adjusting step comprises: determining whether a maximum value (max(T2, T A)) of the delivery air temperature (T A) and the external temperature of the indoor heat exchanger is greater than a first preset temperature value (a) in response to determining that the current outlet wind speed of the fresh air machine is zero; adjusting the outlet wind speed of the fresh air machine to a first wind speed in response to determining that the maximum value (max(T2, T A)) of the delivery air temperature (T A) and the external temperature of the indoor heat exchanger is greater than the first preset temperature value (a), wherein the first wind speed is greater than zero and less than the set wind speed; determining whether the delivery air temperature (T A) is greater than a second preset temperature value (b) in response to determining that the current outlet wind speed of the fresh air machine is the first wind speed, wherein the second preset temperature value (b) is greater than the first preset temperature value (a); and adjusting the outlet wind speed of the fresh air machine to the set wind speed in response to determining that the delivery air temperature (T A) is greater than the second preset temperature value (b). determining whether a maximum value (max(T2, T A)) of the delivery air temperature (T A) and the external temperature of the indoor heat exchanger is greater than a first preset temperature value (a) in response to determining that the current outlet wind speed of the fresh air machine is zero; adjusting the outlet wind speed of the fresh air machine to a first wind speed in response to determining that the maximum value (max(T2, T A)) of the delivery air temperature (T A) and the external temperature of the indoor heat exchanger is greater than the first preset temperature value (a), wherein the first wind speed is greater than zero and less than the set wind speed; determining whether the delivery air temperature (T A) is greater than a second preset temperature value (b) in response to determining that the current outlet wind speed of the fresh air machine is the first wind speed, wherein the second preset temperature value (b) is greater than the first preset temperature value (a); and adjusting the outlet wind speed of the fresh air machine to the set wind speed in response to determining that the delivery air temperature (T A) is greater than the second preset temperature value (b).