Since the implementation of the 12th Five-Year Plan, the Internet of Things has developed rapidly and people have entered the era of “The Internet of everything”. Technology has changed the forensics environment, and the storage environment of electronic data has changed from terminal to cloud. Investigation and evidence collection is becoming “intelligent”, the scene of evidence collection is shifting from physical scene to virtual scene, and the center of evidence collection is shifting from physical trace to cloud trace. In addition to pay attention to the change itself, we must also pay attention to the people closely related to the change, that is, the main body of this paper-police officers. Under the Internet of things, the environment of evidence collection has changed, and investigators have also fallen into the dilemma of investigation and evidence collection. We urgently need to discuss the countermeasures of the dilemma of evidence collection. the author summarizes the dilemma of police forensics adaptation from five dimensions: forensics thinking, forensics mode, forensics condition, forensics scene and forensics process, and explores the methods of police officers to adapt to the dilemma of evidence collection.