The invention provides a WiFi wireless control-based intelligent spraying robot which comprises a video acquisition device, a mobile equipment terminal, a system control part and a spraying device, wherein the system control part comprises a dolly module, a WiFi module, a single-chip microcomputer module, a driver module and an obstacle avoidance module. The dolly module comprises a quad-driver track, an aluminium alloy body shell and two motors which are connected in parallel and are positioned at left and right sides of a dolly to drive the dolly. According to the WiFi wireless control-based intelligent spraying robot, a touch button of smartphone software is triggered to send a control instruction so as to accurately control the robot to walk along a right route and spray a crop. By the use of the spraying robot for spraying, pesticides are prevented from being directly contacted with human body during the spraying process, harm of pesticides to human is reduced, physical labor of spraying workers is minimized, and work efficiency is raised.