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Your website has been marked as malware or phishing site.
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The sources of your website may be compromised.
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Some files of website have been modified with malicious script/code.
This article will guide you on how to resolve this problem. Kindly follow below mentioned steps, in order to proceed:

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Secure all accounts [E.g. FTP]; using which the script/code for the website is uploaded with strong passwords. Secure all mailing accounts, if mails are sent using contact page(s) of website with strong passwords.
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Check the script/code of website with the help of its developer; scan it at your local system by some sort of antivirus applications.
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If website is hosted in the system [especially from IIS], scan that system also. It is also recommended to schedule a scan at regular interval in this case.
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Once, this has been done and you are sure about the actions taken, kindly file a delisting request from your Google Webmaster account. You can also refer to below mentioned URL for the same:
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Sign in to Webmaster Tools with your Google account.
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On the Dashboard, select the site you want.
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On the Overview page, click Request a review and follow the instructions.