A dehumidifier is used to solve the problem of poor dehumidification effect of conventional dehumidifiers. The dehumidifier includes a casing with an air inlet and an air outlet, a heat exchange module located in the casing, an enhanced dehumidification module, and a fan located in the casing. The heat exchange module has an evaporator, a condenser and a compressor connected by pipelines, the evaporator and the condenser are located between the air inlet and the air outlet. The enhanced dehumidification module is located between the evaporator and the condenser, and the enhanced dehumidification module has several water blocking parts extending longitudinally, and the several water blocking parts are not in contact with each other. The fan is used to guide the airflow through the air inlet, the evaporator, the enhanced dehumidification module, the condenser and the air outlet in sequence.