Harmless treatment and utilization method of biological pharmacy wastewater

The invention provides a harmless treatment and utilization method of biological pharmacy wastewater. The method comprises the following steps that biological pharmacy wastewater to be treated is prepared into pretreatment liquid; the pretreatment liquid, an auxiliary agent and a carbon source substance are mixed to be prepared into water coal slurry; the water coal slurry is subjected to gasification reaction at 1000 DEG C to 1700 DEG C and 0.5MPa to 5MPa in oxygen-containing atmosphere; a gaseous product and liquid molten slag are obtained; the gaseous product and the liquid molten slag aresubjected to chilling and are separated to obtain mixed gas and glass state slag. The water coal slurry gasification technology is used; organic ingredients in the biological pharmacy wastewater are converted into gas such as CO, H2 and SO2; after purification and transformation treatment, cleaned gas rich in H2 and CO2 are obtained and can be used as raw materials for producing ammonium bicarbonate; toxic and harmful sub