Provided is a method for preparing pimavanserin including reacting an intermediate compound represented by Formula (II) with N-(4-fluorobenzyl)-1-methylpiperidin-4-amine or a salt thereof, or reacting an intermediate compound represented by Formula (IV) with 4-isobutoxybenzylamine or a salt thereof, wherein L represents a heteroaryl group, —OR1 or halogen, and wherein R1 represents C1 to C10 alkyl or aryl. The present disclosure provides the method for preparing pimavanserin without the use of isocyanate intermediate.
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