The utility model relates to a novel prefabricated plate concatenation formula inspection shaft, the main power supply that is city underground infrastructure, the feedwater, the drainage, the communication, cable television, the gas pipe, installations such as street lamp circuit and easy maintenance and set up, it is by top cap (1) of taking the manhole, foraminiferous mainboard (2), connect corner post (3), preset nut (4), connecting bolt (5), lock nut (6), solid curb plate (7), it constitutes to accept bottom plate (8), the brick inspection shaft waterproof performance of solution tradition that can be better is poor, unfavorable factors such as perishable loses, and through guaranteeing concrete quality in prefabricate form, improve concrete intensity, increase inspection shaft life,and reducing under the artifical condition about dropping into, the efficiency of the installation is greatly improved.