Sharing the copy of the police complaint on Twitter, Singh said he will not get intimidated by such threats.
Singh said they do not need to live in fear of the Adityanath government.
Singh was speaking to media when a man threw ink on him. Dipak Sharma, who allegedly carried out the attack, is believed to be a member of Rashtriya Swabhiman Dal.
There is "no doubt now who was behind the attack", Singh said on Twitter as he posted a picture purportedly showing his alleged attacker Deepak Sharma with ADG Kumar.
Singh is among the several political leaders who have visited Hathras to meet the family members of the 19-year-old Dalit woman who died on September 29.
Singh is one of the eight MPs who were suspended for the remaining part of the Monsoon Session over ‘unruly behaviour’ during the passage of the farm Bills in the Upper House of Parliament.
The Uttar Pradesh Police had lodged an FIR against the AAP leader under various sections of the IPC on September 2 for undertaking a "caste" survey.
A sedition charge under 124 (A) was also included in the notice sent to Singh by the Lucknow Police on Thursday, sources said.
Aam Aadmi Party leader and Rajya Sabha MP Sanjay Singh on Friday raised the issue of sedition charges being filed against him in Uttar Pradesh in Parliament.
Sanjay Singh, who is in-charge of state unit of the Aam Aadmi Party, said he will visit UP on Sunday and get himself arrested.
Earlier in the day, the AAP MP also raised this matter in Rajya Sabha, alleging corruption in the purchase of COVID-19-related equipments by the Uttar Pradesh government.
Sanjay Singh's reaction came to Gandhi's allegation that IAC movement and AAP were propped up by RSS-BJP to subvert democracy.
The reaction comes a day after it was revealed that the police have named politicians Yogendra Yadav and Sitaram Yechury in its charge sheet, which also has the name of student leader Umar Khalid.
On August 19, the Supreme Court had asked the probe agency to investigate the case related to the actor's death.
Sanjay Singh claimed that these cases have been filed because he wanted to show the reality to the Uttar Pradesh government.