The invention provides a temporary supporting and net laying device. The temporary supporting and net laying device comprises a rack, a temporary supporting mechanism and an automatic net laying mechanism. The temporary supporting mechanism comprises a lower stable support, a lower stable oil cylinder, a lifting oil cylinder, a connecting rod leveling mechanism, a connecting seat and a top joint beam. The automatic net laying mechanism comprises a reel net lifting oil cylinder, a reel net lifting mechanism and a reel net bracket. The lower stable support and the lower stable oil cylinder are connected with the rack, and the lower stable support and the lower stable oil cylinder are in pin connection. The two ends of the lifting oil cylinder are connected with the rack and the connecting seat correspondingly, and the top joint beam is connected with the rack. The two ends of the reel net lifting oil cylinder are connected with the reel net lifting mechanism and the rack correspondingly.The reel net bracket and the reel net lifting mechanism are slidably connected. The technical problems that in the prior art, supporting and net laying operation is conducted in a manual operation mode, consequently, the working efficiency is low, and the harsh and dangerous environment influences health and safety of workers are solved.