A detergent box for a laundry treating apparatus comprising: a body portion providing a space for storing a detergent and having an opening at a top thereof; a housing allowing the body portion to be detachably accommodated therein; a housing through hole formed through a lower portion of the housing to allow water only from a tub of the laundry treating apparatus to be introduced therein or said water and the detergent to be discharged together; a discharge pipe protruding from a lower portion of the body portion toward the opening and having a hollow for discharging the detergent; and a discharge pipe cover configured to guide the water and the detergent into the hollow when a reference amount or a larger amount of water flows into the body portion , at least a part of the discharge pipe being inserted into the discharge pipe cover , the detergent box further comprising a block unit communicating with the discharge pipe and having a predetermined space between a lower portion of the body portion and a bottom surface of the housing to prevent water introduced into the housing from flowing into the discharge pipe , and wherein, when the body portion is accommodated in the housing , an outer circumferential surface of the body portion and a side surface of the housing are spaced apart from each other by a predetermined distance, and the side surface of the housing is arranged at a higher position than the opening such that water introduced into the housing flows into the body portion through the opening along the outer circumferential surface of the body portion , wherein the block unit comprises: a block body accommodated in the housing , at least a part of the body portion being accommodated in the block body ; and a block through hole formed in a bottom surface of the block body such that the detergent discharged from the discharge pipe is discharged into the housing and preferably the block unit further comprises: a block check valve arranged outside the bottom surface of the block body to shield the block through hole . a body portion providing a space for storing a detergent and having an opening at a top thereof; a housing allowing the body portion to be detachably accommodated therein; a housing through hole formed through a lower portion of the housing to allow water only from a tub of the laundry treating apparatus to be introduced therein or said water and the detergent to be discharged together; a discharge pipe protruding from a lower portion of the body portion toward the opening and having a hollow for discharging the detergent; and a discharge pipe cover configured to guide the water and the detergent into the hollow when a reference amount or a larger amount of water flows into the body portion , at least a part of the discharge pipe being inserted into the discharge pipe cover , the detergent box further comprising a block unit communicating with the discharge pipe and having a predetermined space between a lower portion of the body portion and a bottom surface of the housing to prevent water introduced into the housing from flowing into the discharge pipe , and wherein, when the body portion is accommodated in the housing , an outer circumferential surface of the body portion and a side surface of the housing are spaced apart from each other by a predetermined distance, and the side surface of the housing is arranged at a higher position than the opening such that water introduced into the housing flows into the body portion through the opening along the outer circumferential surface of the body portion , wherein the block unit comprises: a block body accommodated in the housing , at least a part of the body portion being accommodated in the block body ; and <EOS>