The utility model relates to a novel circuit board is fixed device, including upper and lower superimposed upper plate and hypoplastron, V type groove has been seted up with coincide department of the relative both sides of hypoplastron to the upper plate, V type groove is provided with most advancedly rather than matcing the ejector pad, still include the PIN needle, the PIN needle includes the pillar and sets up in the elasticity of pillar tip most advancedly, elasticity is most advanced including toper portion and fixed part, toper portion is met by a plurality of shell fragment tip and encloses synthetic toper structure, synthetic cylindric fixed part is enclosed in the extension of shell fragment other end syntropy, the slidable cover is equipped with and pushes away the cover on the pillar, it is provided with the expansion tip that can be strutted the elasticity pointed end by inside to push away set one end, the pillar is fixed in the hypoplastron, it is fixed in the upper plate to push away the cover. The utility model discloses make things convenient for the plug, practice thrift installation time, improve production efficiency, connect moreover stably, it is fixed effectual, can play the guard action to the hole site of circuit board.