The invention discloses a PCB (printed circuit board) placing shelf, comprising a support plate and two clamping plates arranged on the support plate, a bottom leg is arranged below the support plate, the support plate is symmetrically provided with two sliding chutes, the clamping plates are installed on the sliding chutes in a sliding manner via sliding blocks that are arranged at the bottom of the clamping plates and match the sliding chutes, one sides of the two clamping plates, which opposite to each other, are both provided with clamping grooves used for clamping a PCB between the two clamping plates, two ends of the clamping plates, which are positioned above the clamping grooves, are provided with first through holes, the two ends of the clamping plates, which are positioned below the clamping grooves, are provided with second through holes which are corresponding to the first through holes in positions, the pore diameters of the second through holes are less than those of the first through holes, the threaded rods of bolts pass through the second through holes to install the sliding blocks at the bottom of the clamping plates, and tensioning blocks are arranged below the sliding blocks. The PCB placing shelf of the invention has a simple structure, and is reasonable in design, and convenient to use.