The invention relates to an on-site measurement device for extrusion deformation of the front of a tunnel face. The on-site measurement device is arranged in a drilled hole of the tunnel face and comprises a measurement assembly, a plurality of displacement transmission assemblies, a fixing part and a glass fiber anchor bolt, wherein the multiple displacement transmission assemblies and the glass fiber anchor bolt are connected with the fixing part; each displacement transmission assembly comprises an anchoring end and a plurality of displacement transmission units connected end to end, each displacement transmission unit comprises a displacement transmission rod and a transmission rod sleeve arranged outside the displacement transmission rod in a sleeving mode, and the anchoring end is connected with the innermost displacement transmission rod; and the measurement assembly is connected with the outermost displacement transmission rod. Compared with the prior art, the on-site measurement device for extrusion deformation of the front of the tunnel face has the advantages of being simple in structure, low in engineering cost, convenient to use and the like.