A virtual reality helmet (300) and a virtual reality system (500) are disclosed. The virtual reality helmet comprises a helmet body (100) and an optical system (110), and the optical system is provided within the helmet body. The helmet body is provided with a detachable display screen (200). In operation, the display screen is snap-fitted to the helmet body, connects to an external video playing device (400) via a video transmission line, and displays the video data played by the video playing device. The optical system is configured to image a light emitted by the display screen. The video playing device is not attached to the helmet body, which reduces the weight worn on the head, and long-term usage does not easily cause neck fatigue.