The invention provides a lentinula edodes drying device. A drying chamber is internally provided with a lentinula edodes frame, an air duct is formed between the drying chamber and the lentinula edodes frame, a heat pump comprises an indoor unit and an outdoor unit, the outdoor unit is used for providing heat energy for the indoor unit, the indoor unit is used for heating air in the air duct, high-temperature air in the air duct flows through the interior of the lentinula edodes frame to heat lentinula edodes, the high-temperature air passes through the lentinula edodes frame and then is discharged to enter a heat recovery room, so that air sent by an auxiliary fan is heated, air discharged from the heat recovery room enters the outdoor unit of the heat pump, and then the heat energy is recycled. Compared with the prior art, the drying device utilizes the heat pump to generate the heat energy when heating the lentinula edodes, wood is not needed in the lentinula edodes drying process, and the drying cost of the lentinula edodes is lowered; in addition, the drying device cannot pollute the environment in the working process, the outdoor unit is used for conducting waste-heat utilization on the discharged air, and the heat loss of the drying device is reduced.