The invention relates to a civil construction pouring device. The device comprises supporting plates, fixing plates, wedge-shaped plates and clamping plates which are arranged on the outer side of a pouring cylinder symmetrically, and the device also comprises drive motors, threaded pipes and threaded rods, wherein the pouring cylinder is hoisted to the top of a pipe column through a hoisting device, the top of the pipe column makes contact with bottom ends of the left supporting plate and the right supporting plate to perform a supporting function, then the threaded pipes are driven synchronously to rotate by the drive motors, the left clamping plate and the right clamping plate are driven to move downwards, the left clamping plate and the right clamping plate move relatively while movingdownwards due to the fact that the left wedge-shaped plate and the right wedge-shaped plate are matched with the left clamping plate and the right clamping plate respectively, accordingly, arc-shapedstructures of the left clamping plate and the right clamping plate clamp the outer side of the pipe column, and the pouring cylinder is fixed. Clamping blocks slide transversely along clamping grooves when the clamping plates move downwards, so that the left clamping plate and the right clamping plate can perform clamping transversely, the stability of the pouring cylinder is improved, the concrete pouring quality is enhanced, and the safety and the practicability are improved.