The invention discloses a live broadcast key point hinting method, a server, a user terminal and a system. The method comprises the steps that an acquisition device acquires the volume of an activity site environment in real time and sends the acquisition value to a server; when the server determines that the acquisition value is greater than a preset threshold value, a live broadcast time-point corresponding to the acquisition value is recorded as a key point, and a key point hinting notification is generated and sent to the user terminal; and the user terminal receives the key point hinting notification and hints a user. According to the invention, when live broadcast is carried out, the user is timely hinted at the live broadcast key point; the user can focus on watching the live broadcast at the live broadcast key point; and the problem of serious live broadcast watching experience missing, which is caused by the fact that the user misses the live broadcast key point, is effectively prevented.