Indirect evaporative cooling device capable of preventing condensation and frosting

The invention relates to the technical field of air conditioning equipment, in particular to an indirect evaporative cooling device capable of preventing condensation and frosting. The indirect evaporative cooling device comprises a fresh air pipe, a return air pipe, a bypass air pipe, an exhaust fan, a spraying assembly and a heat exchanger. The fresh air pipe and the return air pipe penetrate through the heat exchanger. A bypass air pipe air inlet is formed in the pipe wall between a fresh air pipe air outlet and the heat exchanger. A bypass air pipe air outlet is formed in the pipe wall between a fresh air pipe air inlet and the heat exchanger. The bypass air pipe communicates with the fresh air pipe through the bypass air pipe air inlet and the bypass air pipe air outlet. The exhaust fan is arranged in the position, between the return air pipe air outlet and the heat exchanger, of the return air pipe. The spraying assembly is arranged in the position, between the fresh air pipe air inlet and the heat exch