A dual-cavity injection device includes a cavity module. The cavity module further includes a main cavity. The main cavity system has a first cavity and a second cavity. The first cavity. A blocking plate is provided in the middle of the second chamber. The cavity module is connected to an injection module. The injection module further includes a needle seat. The needle seat has a guide groove on the outer peripheral surface. A needle is arranged at the axis of the needle seat, and the other end of the needle is located in the main cavity. An inner cylinder is sleeved on the needle seat, and a tenon is arranged on the peripheral surface of the inner cylinder. The tenon is used for It is fastened to the guide groove, and finally, an outer cylinder is sleeved outside the inner cylinder, and an accommodating groove is formed to extend inward from the bottom of the outer cylinder, the accommodating groove is just to accommodate one end of the needle, and the accommodating The peripheral edge of the groove is just at the bottom of the fixed seat.一種雙腔式注射裝置，係包括一腔體模組，該腔體模組更包括一主腔體，該主腔體係分別具有一第一腔室及一第二腔室，該第一腔室與第二腔室之中間位置係設有一阻隔板，該腔體模組連接一注射模組，該注射模組更包括一針座，該針座外周面上係具有一導槽，再於該針座軸心位置設有一針頭，該針頭另一端恰位於該主腔體內，於該針座上係套設一內筒，於該內筒周面上係具有一卡榫，該卡榫用以扣合於該導槽，最後，於該內筒外係套設一外筒，自該外筒底部向內延伸形成一容置槽，該容置槽恰容設該針頭一端，且該容置槽之周緣恰頂掣於該固定座底部位置。
